I challenge you to find a lineup with AF, 2 other water ninjas + 1 non water ninja that is able to beat Itachi Susano'o, Shisui, SB + a non fire ninja of your choice that completes the meta.

And even if you find one, it works better with another main, so it's useless to run it with azure fang.

If we talk about the anime i don't see why tobirama should be weaker than itachi or why mei should be weaker than shisui, the point is they made them weaker and unable to get a good synergy together and together with azure fang.

P.S. The team you talk about doesn't meet the requirements garv asked since edo hashirama and kurenai aren't water ninjas. Moreover, even if the team is able to win (maybe, and i am not even that sure, since there's no ninja that's able to proc the 10 combo to let trigger the high chases if not hashirama mystery and hashirama mystery can be easily interrupted by the enemy and if hits shisui you get no water style water trumphet and no king of hell so no hashirama chase neither + to let hashirama heal and remove debuffs on azure fang azure fang is compelled to run nature energy gathering and so not healing tips or neurotoxin this means she is compelled to run shark bomb, since reg. healing jutsu doesn't get boosted by nature energy gathering boost ) it still requires the hardest to get ninja currently + a whale only ninja (hokage tsunade) while itachi susano'o currently is way easier to gain and can be easily swapped with the free itachi anbu to get almost the same outcome and shisui can be bought in events with 15k coupons.

EDIT: you are right saying the real strenght of AF currently are healing and chaosing, but the point of Garv is exactly that: both of those points of strenght are denied exactly by the only main that should be weak to them.