One stat to rule them all, or what if we merged Dex and Str?

[KorvinStarmast]

But this is the beauty of it.

I don't see any beauty in it, I see additional complexity with no added value.

The six attributes are a useful shorthand for roleplaying, even if their interactions with the rules lead to certain choices being strictly more/less optimal.

They are good enough if not perfect.

On this note, though, the forum's Grod the Giant also put together some rules for playing 5e without ability scores (included in this, I think), which might be an easier pitch than tweaking the ability score system.

That would be fun to play test, but I don't think any of my players would care to do that.
They just want to play.
They don't demand perfection. "Good enough" is fit for purpose.