Furthermore, you could test this a few ways. Hex someone's Dex and then try to shove them. See if they do it at disadvantage (I think you can find this in the combat log). Repeat with Grease (shouldn't but again, who knows). Also attempt choosing STR for the shove test since normally the person being shoved or grappled has a choice between Athletics (Str) and Acrobatics (Dex)... though if they're smart like a player they would pick the one without disadvantage so (shrug).
Those are some good ideas for tests, Il try those, thanks.
This line of thought also makes me wonder, would an enemy's attack roll constitute an "ability check" under this line of thinking?
For instance, as an example, if an enemy is shooting at me from range with a shortbow, and I hex their dexterity, would that impose a disadvantage on the enemy's chance to hit me?
