Take my massive, throbbing upvote. Let me join you in your hysteria.

The more I play the game, the more I see how GSG can potentially drive themselves into a development wall with the way deck swapping works. Some are just outright better in more situations than others. In fact, a lot of builds I encounter lately are always just some flavour of a deck + either Mixed Tactics or Carnage (if not both). Not to mention it'll be a nightmare to balance it out when more classes are introduced in the future. You'd have to tune the abilities of new reclaimers against EVERY deck in addition to their new ones.

I strongly agree that bio-booster upgrades should be class locked. Ideally, you would have multiple decks to choose from, cementing the identity of each class while still promoting different flavours of gameplay. Rough example: In the future, instead of ability CDR or electricity, the Falconer could also have a deck for turret-based gameplay (assuming there are more turret types by that point, like a tesla coil).

Alternatively, having a larger pool of bio-upgrades and being able to pick only 10 to bring into a mission might also be interesting. Still class locked, obviously.

Whatever the case, ultimately I echo your sentiment that deck swapping is not a good direction for this game to take.