Blue
Ravenous Bugblatter Beast of Traal
I agree, and I've been considering merging Strength and Constitution.
However, I do feel like Dex has too much (initiative modifier, attack modifier for ranged or finesse, AC modifier, & one of the most important damage reducing saves in 5e) in relation to the other scores, and a score that takes away from just the Dex stat seems more like it's creating stat parity than it is diluting useful stats into dump stats.
Perhaps if there is concerns about diluting stats and separate concerns abotu Dex being overloaded, the option would be to move some of what Dex has to other, existing scores.
Being able to assess a situation and craft a reaction sounds like INT, which no one will say is an overloaded ability score. Move Initiative off to it.
There's been some who say that 5e has made ranged combat too good. Perhaps go back to an earlier edition and keep finesse and ranged weapon damage bonus with STR. Higher pull bows, etc. This also keeps STR more important.
This would leave DEX as AC mod (in light and partially in medium), attack bonus with finesse & ranged (but not damage), and one of the big-three saves. Still a good ability score, but not as overpowering.