Probably the most entertaining game to try and break down and cast/analyze, with its unique mix of heavy mechanical skill, gamesense, and teamplay. There's also lots more shenanigans that happen in TF2 compared to other games like CSGO. High level offclass plays are super fun to watch, and can be quite funny, especially if something that shouldn't work does. In games like CSGO you only really get that kind of novelty on pretty rare occasions like knife kills or high risk bomb defusals.
It's also very easy to come back to something you're comfortable with; I know I've definitely been exploring other esports like CSGO and OW but the ability to just come back and within a few weeks derust playing/casting/observing can be extremely refreshing.
It's also where all my friends are <3