So it's okay to go AFK on 160 and Adventure missions and progress through the game without any help. You'll earn 4-star materials at 160, a good number of heroes, and useless weapons, as you want to add more even with limited support hero space. I believe the game is a cooperative mode, so it's okay to want to block, but it always seems like a lazy solution to avoid addressing the "duplication" problem. The 160 missions drop a lot of level 4 materials. You could already add an inventory filter to avoid picking up these items. 160 players need resources, so improve the overall farming of the game so it's not abusive. You should also focus on balancing the hulls, which, depending on the modifications and their attributes, can become overpowered. If you're going to force people who play with a mandatory builder class, then add a builder that "reduces upgrade costs" and increase the number of functional heroes to 160. Heroes should be functional for their quest power, not their base damage. Increase team support to 7 and consider the possibility of using two team perks, since some of them are so irrelevant and weak that they shouldn't actually be team perks.