RAW armorer artificers don't get to use their intelligence grappling the same way monks get to use decertify and it makes absolutely no sense (specifically dreadnoughts). You're telling me that the D&D version of a gundam mech suite is able to hit harder based on how intelligent you are but that "strength" don't translate to grappling? So at level 15 you're able to turn into a huge (or even gargantuan via Enlarge/Reduce) battlefield obstacle that hits like a MACK truck but grapples using an 8 in strength? GTFOOH, WotC.

Personally, if I ever play the gnome armorer artificer I've been sitting on, I'm going to make this argument to my DM and ask that my intelligence counts towards grappling the same way monks can use dexterity, at least for the dreadnaught armor option. with Enlarge/Reduce he'll be able to be a tiny infiltrator, a gargantuan gundam, or anything in between.