TLDR: Please let me buy squad slots without buying premium, especially now that they have been refunded.
I don’t need premium account anymore. I have 99% of content post merge unlocked, paying to get 100% extra exp would just be silly. For that reason I bought some extra squad slots back when I still had prem, however, now they have been refunded and I can’t just buy them again. I still think +2 free squad slot unlocks through challenging missions would be the best way to do this, but at the very least let me re-buy the squad slots I had without also having to buy prem time!