So here, you appear to be claiming that 15 in a stat isn't extraordinary.
And here you are saying that it is.
Do you think that there is a chance that you might have misrepresented the people in the first statement and the ones similar to it?
As I shown, and what I think
@Faolyn is getting at, is that Extraordinary in the fiction does not equal extraordinary in the mechanics.
To re-give a strength example from back when people kept bringing up elephants and mice, a Spider has a strength score of 2. They have a -4 on every check involving their strength, and they are basically worthless in terms of strength based feats...
They can also drag 60 lbs, meaning they can carry off the average 8 year old child with no effort whatsoever.
There is a disconnect between the representations. Lifting 450 lbs is incredibly impressive. Getting a +2 on your attack roll is pretty crap.
There is nothing wrong with that. It is a good justification for putting your high roll or score into that ability.
Claiming that the character is non-viable without an additional +2 to whatever you rolled/assigned to that ability is what distinguishes the optimiser.
We want the level 1 average. That isn't so terrible, is it?
I've no issue with a being approaching demigod status that has specialised in doing something really well, can regularly achieve feats that a commoner would view as impossible.
Cool. Why did you skip all of the important parts of that post to jump down to the least important part?
Bear in mind that in most situations, a PC could achieve that average task without needing a roll. Only in situations that the DM deems are stressful enough to require a roll is there a 50%/55% chance of failure.
So you want to change the definitions.
An Easy task shouldn't be an actual easy task. It should be an "easy task to accomplish while under intense pressure that may cause you to fail half the time". How then should we define a hard task? I mean, a hard task is already difficult, but now it has to be particular difficult while under duress?
And look at the examples in the DMG on page 237. Under strength we have "Use a spike to wedge a door shut" Is that supposed to be difficult? Are we supposed to assume you are doing it quickly under duress, or is this meant to be an example for doing so in general? Intelligence has "recall a bit of lore" is that on a time limit? How do we add stress that would make recalling it more difficult, do we only roll intelligence checks while you are menaced by an enemy? Constitution says "Win a Drinking Contest" So are we to assume this is a contest you are in while being attacked? How do you add stress to a contest to make it require a roll?
I mean sure, it sounds nice to say that we should only call for rolls when you might fail, but then... what determines if you might fail? Does a Goliath with 10 strength automatically succeed on busting down that wooden door because he weighs 400 lbs and is big, but the 18 strength gnome has to roll because he is small? Do we say that the Dwarf automatically wins the drinking contest, without even needing to roll, while if they were an elf with 18 con they would need to roll for that victory?
I don't think it is nearly as cut and dry as you want your post to make it seem. This is an issue with a lot of complicated moving parts that impacts the entire skill system and how we utilize it.
Or...
We can let a 1st level character have their 16 in their prime score.
I've got no issue with you not feeling happy playing a character that can't meet any particular qualification you choose to set. - Your requirements for enjoyment are your own personal business.
And I fully accept that a character with a 15 in an ability score is going to be slightly worse at things governed by it than a character with a 16. Just as that character with a 16 is going to be worse at those things by the one with an 18 in it.
What I am objecting to is the claim that the character with the 15 "sucks", or isn't viable, or that someone with an effective 15 in a stat isn't strong, or bright or whatever. That is rank elitism, whether you're claiming it on an internet board, telling a new player that when you see their character, or saying the equivalent to someone in a non-D&D context.
Accuse me of rank elitism all you want. I let a player make that choice without saying anything once. They hated the entire game because of how badly their character performed, always falling behind the expected curve for their characters entire span in my campaign.
Should I just sit by quietly and let it happen again? I tore me up inside to hear him come to truly despise his own character, because it felt like all he did was waste resources in combat while the more optimized characters tore encounters apart.
Oh, and by "more optimized" I mean a elven rogue archer, a dual-wielding Orc Blood Hunter, and a Goliath Zealot Barbian, without GWM. They didn't even have a truly high tier build at the table. Those guys were, fairly average in terms of combat capability. And he felt worthless.
Maybe that +1 wouldn't have made a difference. Maybe it was all in just a year's worth of bad luck and poor die rolls. But since it so closely mirrored my own experience, where I felt the same frustrations with a cleric, who also started with a 15 as their highest stat, I'm fairly certain in saying it wasn't just a fluke. It wasn't just me.
16 is the average expected score for a 1st level character in their prime stat. You can call that whatever name you want to call it, elitism, powergaming, min-maxing, but I notice something interesting.
No one jumped in to call a Gnome Wizard min-maxing. No one has jumped in to say a Wood Elf Ranger is elitist. No one has cried that playing a Tiefling Warlock being an optimizer. Or a Half-Orc Barbarian.
We are only elitist min-maxing optimizers when we want to play a halfling wizard with a 16. A Wood Elf Warlock, with a 16. A Tiefling Barbarian with a 16. Then we are elitist. Then we are min-maxxing, because can't we just accept that we can't be as good as someone born to the role can be?