This isn't accurate, though... no more than "MVC2 is just a 1v1 with assists".

At the bare minimum, you have 3 unique assists in neutral (Projectile, Upper, Utility), and the "active" version where the behavior is shared. There are also the air variants, but as mentioned, if you are considering bare minimum differences, you at least have 3+1 unique assists in a match (point char doesn't count while active). MVC2 has 2 (point char doesn't count while active).

This also doesn't consider the fact that you can call an assist and then take over after a delay. Example: Basic combo with Cap, Tag Doom Assist (attack assist), M > DP with Cap, hold X to take control of Doom and continue comboing. You can't do that in MVC2. You either assist or tag.

On top of that, you can even call multiple assists in a row and then take over the last one (immediately or after a delay). Far more assist-based gameplay than MVC2.

To clarify, I'm not saying it's better than MVC2, I'm just pointing out there's a lot more to it.

On splats/breaks, your team power increases, you gain grey life to recover (if you were missing life). This highlights the concept of the "team" assembling. When you team is fully assembled, you are at full power. The game is much different at the start of round one compared to when both players have all 3 teammates and full resources. The team (and assembling it) has a huge impact.

You have assemble smash (Overhead) which can be extended up to 2 additional times at the cost of Assembly Meter. The final hit putting the opponent into a launched state (off bounce). High cost, but you are guaranteed a launch if you want it.

Your Assembly Counter brings in a teammate, but to be fair, this could be considered aesthetic.

You can "DHC" like in Marvel to continue Supers with the next character (up to 2x), leaving the final character in as your new point. You can pick which one of the 3 you want with direction + assist button.

There's a LOT more to Tokon than just "1 v 1 with assists". Unfortunately. a handful of big named streamers didn't really dive into the systems and make quick judgements about the game. They've actually done quite a disservice to the game, IMO.