Just doesn't scratch the same itch for me really. Overwatch is ridiculously well polished and many character kits have so much depth. I played Marvel Rivals for a bit but the character kits just do not have the same level of polish or depth as Overwatch, I ended up going back once I reached Celestial rank and felt like I'd explored everything the game has to offer. A couple characters do have Overwatch level of depth (Loki and Strange stand out) but I'm primarily a support main, all supports are very shallow.

Also I'm drawn to female characters and TF2 is like, almost all male. I couldn't get into Deadlock for the same reason I didn't identify with literally any character personality or design so "maining" any of them just totally didn't appeal to me at all. I still end up learning to play all chars in a game because it makes you better overall but like... I need to like and get attached to playing as someone. Maybe it's a fighting game mentality but people definitely choose characters based on identity factors in fighting games and I carry it over into other stuff.