So, just like the hexblade, is it now possible to replace the strength in place of charisma? I know it was suggested in 2017 and the quick solution was to override that weapons stats using customize, but that must be done for every weapon. Should not be too hard to implement, it is pretty much Math.Max(any stat that can be used for attacking).

Or even better if we can substitute any stat for any other.

Like make a wisdom save. You can use your strength instead of you wisdom. +3 to STR, +2 to WIS. Well I will use my strength.

Your idea about saves would make the entire save system fall apart. Remember, if you could do it, so could the monsters. 

I am not saying everyone should have these. I don't care if the monsters can have it. I just want the flexibility of it. It is more to help homebrew things in general.

There is already dex to str for attacks, so I dont why they cant make it.

No, not right now. The way that hexblade is implemented is a checkbox on the weapon's sidebar.

You can use a custom action / override, but that is about it.