A restriction on class change would certainly help slow the spread of cancer and bandwagon

I mean it is a good thing for player wanting to experiment different things or "change their mind". But when it is used for bandwagons....

Take the current water meta for example. If class change isn't a thing, then for one thing there won't be so many of them. For another, water does have more difficulty, I believe, in ninja exam. And not clearing the new 180 tier means they are going to be a 1k power down by default, which curbs it somewhat (maybe not even 140? Earth is the way to go there after all).

The problem with just "fixing 3 healer team", so to speak is that even if that's done, there will be a new meta. And players will flock to whatever that might be and the bandwagon will continue. On the other hand, if the fix is instead put on the method of bandwagoning, then at least it would never be so bad.

Also, game balancing is hard. So even if they patch the game every other week with balance changes, all that would achieve is that people have to continuously find new meta as opposed to stay with one for a long time. This might be a bit more draining on resources (awakening mats for more common ninjas and coupon/ingots if buying specific ninjas are required) and somewhat curb bandwagoning as it won't have time to propagate much, but it's not going to actually stop meta(and at that, it's probably unrealistic as they couldn't come up with a fix until a meta becomes a problem in the first place). While it's true that this game is especially slow in balancing fixes, it's a war that devs will never win in the end anyway.

So really, hindering the act of bandwagon is probably more effective than fixing any particular meta.

Of course, as long as it's a restriction and not removal, it can probably be bypassed with $, so in the end it just makes ptw able to meta while ftp unable to, which is undesirable in and of itself. So that's bad.

But imagine, if class change is removed and then they patched to make water the worst class. Imagine the suffering of the bandwagoners!