They don't need to keep adding assists to characters lol.
Tag system is like a reverse assist. Your point character is the assist which is supporting the character in reserve. Once you rewire your brain to understand that, then you realize that the sky becomes the limit with the system.
Iron Man does Unibeam, tags to Strider on start up, Strider does teleport command on entering for a mix up/free get in.
Chun Li does SBK to get in (horizontal) and tags on start up, SBK locks them down while getting on the opponent and your tag in characters gets a mix up/pressure.
Chris does Magnum and tags an opponent, tag into Hawkeye, does Dead Arrow into full combo (will work with every combo for big damage, probably why they are making Magnum a resource as it gives Chris a potential death combo from full screen).
This also works for aerial moves now so now you can use aerial moves as assists. Iron Man does Smart Bombs from super jump height and tags into partner, if Smart Bombs hit then you get a free combo.
Every Hyper is a threat now because say you do random Hyper Charging Star with Captain America, tag into a full combo on hit.
There will be no lack of degenerate stuff in this game. Every character will be a threat anywhere on the screen. Just about anything can be turned into a combo especially with a universal OTG system.
Can't wait until the pros get their hands on this, I already know all the Marvel heads be like...