Curious about one aspect

[YoMommaHasABeard]

Here’s just how I see it.
First, your character will be defined not only by your class. The kinds of weapons that you can use are determined solely by your body type. That means that you will be able to stand your own in combat no matter your class. Even if some of your abilities might be wasted for a few minutes if you make a necessary class switch, a lot of abilities will be universal, body type dependent or maybe even linked to your weapon. All of those will still be in effect.
Second, if you miss an essential class, you can always focus on some secondary objectives first, boosting every team member’s stats in the process. Then you can switch to that sub-optimal class and still be more powerfull then your opponents while you are doing what is necessary.
That said, I’m really looking forward to this and in the end I always end up being that guy who changes classes for the team so it’s not a huge problem for me.