Results in weak, suboptimal builds.
No it doesn't.
I don't think I've ever played a class/race combo where the strong ability score has aligned with the key class ability score, and I've played with plenty of players who, conversely, do put a lot of stock in that... and I have never felt weak, sub-optimal or less functionally effective than other characters. By 4th level, the racial ability bonuses even out more or less, and everyone can get to their twenty easily enough regardless of their choice of race, if that's what they want to do. 5e's bounded scores makes sure that you aren't handicapped by an unusual class-race combo unless you want to be; that's one part of what it's designed to assist with, and it does so well.
It's not because a build works that it's not sub optimal, and it's not because a build is sub optimal that it can't work : These are two very disctinct things, and the "rejection of the loss" effect is a very common thing and a well known issue in game design in general.
You might be able to get through the feeling of doing something "wrong" when you take an unconventional class/race combo that end up with low stats but a lot of people can't, especially in a game where fights are so common.
I'm not convinced at all by the argument that past 4th / 8th level, it evens out : first because if you get a +2 on top on a 15, you still don't get the +4 modifier unlike characters who started with a 16 on their main stat. To get the 20 score on a stat that started at 15, you will have to wait all the way up to level 12, which by that time should be the end of the game
Like i said in my original post, i would like to make my idea optional in order to respect some players intent to play as close as possible to the original dnd5 ruleset
They honestly should just implement custom lineage from Tasha's if they want that. It allows you to customize the stats. I don't think it is actually a huge problem normally because there are a lot of 5e races to choose from (40 by my current count of all official published material including UA). However, the game's race selection is rather limited at the moment and I don't see them adding too many more.
Tasha's custom lineage is a better solution than the +1 homebrew idea in my opinion, because it keeps the bonuses the same while allowing you more flexibility in where they go. This solves the "suboptimal" race/class combo issue without the power creep. But hey, you can always Mod to get whatever stats you want anyway haha.
I wasn't aware a "correction" already existed for that, i hope they'll implement this feature then.
