Oko and Opal make sense. Lattice just seems so weird to me. Yeah "it isn't fun to be locked out of the game" but it's a 2 card, 10 mana combo (4 and 6, so not even spread out terribly much, or at least still significant investments) where it's susceptible to both artifact and walker hate. If decks getting it too fast is a problem, ban one of the Tron lands, they're they engine to abuse the payoff.
If you want to talk about not having fun playing Modern, why don't we ban
Nexus of Fate or one of the pieces of
Cryptic Command plus
Mystic Sanctuary. Both of those lock you out of the game but in a much more miserable "guess I'll see if they can actually kill me but still not get to play for 15 turns." Like if someone gets Karn + lattice down, it's an insta kill if you don't have a response. You don't have to sit miserably for 20 turns watching someone play with themselves, you can just scoop. Unfun being a banning point is way too subjective. Not a fan of how they're doing things at WotC in regards to Modern.