For the most part i think having a decent character picking strategy in SF is necessary especially if you stick around for the years to come.
If you mained Ryu since the days of ST chances are you never really needed to learn alot of new stuff with him because his main fundamentals have never changed. If you mained Yun in 3S chances are you know what to start looking for and working on in AE.
I dont like to think that my main in the first fighting game i took seriously is going to die. Because for the most part if they keep core mechanics like fireball storing im already used to that and can carry it on if she got introduced in a new game down the line.
That being said SF x TK has Abel, who is kinda like a second main to me, so at least my time invested is going to somewhat move on to my next main game. If Juri was there it would be awesome though, Abel x Juri tag team, make it happen.