You, of course, mean lower than -10, which is exactly the problem.
Not a problem at all. "Higher" in terms of AC means improvement or better.
Just what I said, EzekielRaiden.
Yes, you can shift up or down a certain number of places. But the point remains: ordinal numbers aren't and can't be added or subtracted.
Correct.
"First class" plus "second class" doesn't equal anything--it's nonsense.
Not "plus" as addition, "plus" as improvement. Not nonsense. Again, Millions of kids and adults in the 80's and 90's used AD&D AC without issue. How many had problems with it? Who knows? I can only go by my own experiences and that would be 0. Others here have said they struggled with it or knew players who did. I believe them, but since I don't know those individuals I cannot know how AC was explained to them, if the person who was explaining it understood it themselves, or not.
Maybe a magical spell can add that, I won't drag in any argument about that here--but why would a SHIELD do this? This is like saying if you increase any horse's speed by the same fixed amount, it would guarantee move any horse up one place or down one place regardless of what place they're in. It's like saying that combining (not even digging into the ambiguity of how you're "combining" them) a first-class ticket and a second-class ticket will somehow directly produce...what? Should it be one place better? Two? How would you even answer that question? But that's exactly what a shield does.
Why does a shield do that:
A shield is the base measure to represent 1 class better than no armor. So, the +1 factor just means one armor class better. Since these are ordinal numbers (as opposed to cardinal numbers).
As for your horse's speed, which is a cardinal number, this doesn't apply. Would a faster horse place better? Likely, but you have all sorts of other variables involved so it's impossible to know.
For tickets, I don't think you can get better than 1st-class, but I know of people who've been able to combine two-second class tickets into a 1st-class ticket at the whim of the airline. Improvement is possible, certainly.
It takes significantly longer to make a d&d character now than it did with B/X. In some cases, with new players, it takes hours. And then people struggle at the table to keep track of their abilities, from species, class, subclass, some recharging on SR, some on LR...it's a hard game to play.
Yep. It is much more involved, especially for a higher level character, than AD&D was, certainly.
And that means that people do bounce off it or decide it's not for them.
Defintely. I've had more people try 5E and leave the game than I ever did with 1E or 2E. I won't claim other factors might not contribute to that trend, but frankly it amazes me how much I see people struggle with 5E. Perhaps it is just "the times"? I couldn't say, but it does seem strange. It is the reason why myself and others are homebrewing a simpler 5E game, more akin to B/X.