@
Caliban
Again you miss the point. You said it yourself. You counciously, purposely chose to do what you wanted to do. Nothing in the character's creation nudged you in a particuliar direction. And aside from the very entertaining stories, your blade locks basicaly look like anyother blade lock I have seen and heard about. We're not discussing background stories. We're discussing on how min/max racial/class stats can and will influence your choice.
You might have the most comprehensive background tables ever made, it will be a counscious, willfuly choice that you or your DM will have made. Nothing in "tables" or "background stories" will beat what a player will make up to circumvent a situation. The example of Kalian, working his way into paladinhood is one of many example I have seen.
What you described is again, something that new players will rarely do. Yes there are some players out there that will do this spontaneously, but they're not the majority. On the other hand, I have seen dozens upon dozens of players forced into role play mode after rolling some strange sets of attributes just to get into a class.
@
MechaPilot
I will disagree. If you have had any min/maxer in your games. You'll see that they, invariably, follow the same path. Starting stats: 15, 8, 14, 10 or 13, 12, 13 or 10. If variant humans are allowed 1 point in strenght, and one in the 13 where ever it is. (int for the eldritch knight variant, cha for the blade lock variant). Already two different choice? Wow... Again a counscious choice. If you keep the fighter a champion or a battle master it won't matter. Progression will stay the same from one character to another. Yes with the right background, the right player differences will abound, the logic behind the progression won't.
The feat taken will be obviously GWM. Then level 4. ASI into Strength. Level 6, ASI into Strength again. Level 8. ASI into Constitution. Level 12 ASI into Constitution, Level 14 ASI into Constitution again if the campaign goes that far. May be the Tough feat could be sneaked in somewhere.
But take the example of a player who rolled. 14, 15, 14, 10, 6, 14. Ho man... my life is broken, I wanted to do a great weapon master and now I am stuck with a bad array... I'll do one anyway. Stat placement Maybe St and Dex? Feat? Great weapon master. The player starts as a great weapon weilder. Maybe along the way he'll chose medium armor master? Raise is St and Dex at level 6. Dip into the warlock class to get a bit of an extra whomp for a few levels. Now I can imagine a player making a pact to get power and going to every extent possible to find those gauntlets of ogre's power. Some items becomes quite important when you know that the high strength is not that reachable. A 16 might become satisfactory.
A set up like this can bring great role play. Even a totaly perfect beginner will have to role play it through. Especialy if the DM demands a Role Play reason to dip into an other class. Here the player would be more or less nudge into the warlock or sorcerer style. But what if he chose paladin hood instead? He could get an other fighting style (probably defense). Would get the lay on hand. Who knows?
Yes you can do that with the point buy. But you probably won't do it unless you are an experienced player. Most novice will stick to what they have. Race and Class min/max attribute can give the little nudge they need to get into it.