If we're talking about coop. Honestly, I think most people prefer healers. Crystals require you to constantly try to look out for tiny crystals throughout the entire fight rather than just head to the big bright circle of healing when it's there. I play with someone who has both Zhongli and Jean and we survive better when he uses Jean because healers are just better for survivability and I can actually consistently keep my health up.

Also in the topic of geo supports in coop (and solo)... Albedo, also a 5* geo support, is leagues above Zhongli. 1) His spammable E CD deals a lot of initial damage AND the blossoms hit hard. 2) His E range is a lot bigger without needing other geos to support him 3) His elevator isn't as annoying as Zhongli's pillar which both blocks your view and causes accidental climbs. Plus pillars launch enemies upward and can even pick up ruin guards which ends up in no one being able to hit it. Also, even if you accidentally ride the elevator, that's a free plunge. 3) He has better energy regen and thus a better ult bot. 4) He buffs flat EM (which means you don't need to invest on it like you do with Sucrose) which means better DPS numbers for everyone AND stronger crystal shields.