It’s really easy to change your mind as to the country or vehicle you want to play. The vehicle could change br, get nerfed, (an overpowered tank might’ve have been added at that exact battle rating that can shred the squadron one like the bmpt, but we don’t talk about that). And, since squadron research takes months to do, wouldn’t it be just simpler to allow them to be transferable to the vehicle you want? It’s can be rather annoying to have to start from zero on a new vehicle that interests you and leave the previous one with 50k left. This change wouldn’t hurt the gaijin financially, if players want a squadron vehicle sooner, they’ll still spend GE and would make the squadron grind a tad bit better (even tho it takes an unreasonably long time.)