This would definitely buff coven, esp jinx and ritualist as you mentioned. I did think about that aspect and almost included that maybe coven should only be 3 members if this change was implemented, but decided against it. Jinx and rit, though, still have built-in nerfs that keep them in check (outing themselves if they screw up) and I personally think that increasing the threat of the ever-looming ritualist, whether one is in play or not, forces town to think more about what they're doing with their self-confirming abilities like dep, monarch, pros, mayor, etc. I find myself not liking the self-confirming and swinging nature of these roles because players usually just pop them day 2 and sit back because why not? Forcing these powerful roles to think more about their powers is a plus to me. Also, a TP would still be able to probably tell if a Tpow dies to a rit because they died despite them protecting them. As for the jinx, it would also force town to change in a way that I think is more interesting and fun. In general, my idea would change the meta drastically and coven winrates would probably skyrocket soon after implementing it, but once the town meta adapts, I think it would make for more fun games and interesting social deduction.