I would like to see premium squads not take up your regular roster slots, so you can have them avaliable all the time, I don’t feel this is unreasonable request. I’ve got premium squads that I can’t slot into my rosters as I’ve got too many slots filled with regular soldiers. I’ve already got 10 slots for each nation on each campaign, and given their price, and given I pay for premium and battle pass I flat refuse to buy anymore, my choice I guess.
Here’s the thing though, I’ve seen premium squads I want to buy, but I don’t purchase them because I’d have to ditch a regular squad that i enjoy using. Also I think it would motivate FTP players to buy premium squads as they already have very limited squad options. Well I think it makes sense, and you guys are pretty good at listening so I thought I’d suggest it. 
