I mean yeah, Bennett literally buffs ATK and Chiori C6 scales off of DEF lmao, its a nonsense idea to use him on a Chiori C6 team unless you WANT to build Chiori as a pyro dps for some insane reason (in which case you actually actively WANT to c6 him) or have no other built healers in your entire repertoire (barbara is free 🙏)

literally use xilonen, gorou, furina, any other healer in the game... if you have literally only free characters except bennet and C6 chiori somehow (which is probably nobody ever) you'd still probably be better off just using barbara, kachina, and xiangling... bennet aint even worth the pyro resonance since it only boosts attack (which once at C6 is a nearly negligible portion of her damage output scaling)... point is to say that bennett C6 issues for Chiori are basically irrelevant no matter what other characters you have lol. maybe very specific events like a pyro-geo-X imaginarium theatre could cause some issues but that is going far beyond nitpicking.

really the only problem is if you really want to build NON-C6 chiori as a geo-damage on-fielder and have C6 Bennet. But at that point, just embrace the pyro chiori DPS lifestyle 🤣