Okay, so, let’s take this situation:
A player tries to unlock some kind of high rank vehicle (4+). The main vehicle that he/she uses is the one before that, which gives research points bonus.
5 slots are unlocked, the amount that players can get without spending premium currency.
To combat the long repair times/high repair costs, and otherwise take some stress off (Folks don’t expect much from low BR vehicles, generally), the player…
Chooses other vehicles mostly from rank 1, if not reserve.
Practically, it could look like this:
Tiger 2 P (6.3 BR, Rank 4, the main vehicle, researching Tiger 2 H), 15 cm sIG (1.0 BR TD, armed with 150mm gun), flakpanzer 1 (1.3 BR AA vehicle), He-51 C-1 (reserve vehicle, with those funny 6 7kg/0.5kg TNT equivalent bombs), and Hs-123 (1.0 BR bomber plane).
Which, in a way, can be seen as trolling, but it would be a legitimate strategy (I suppose), to bypass some requirement to have more than 1 vehicle in the lineup, or similar restriction to fight the 1 Death Leave. And the thing is, this lineup isn’t exactly terrible - it is possible to do something with these vehicles (aside from perhaps He-51), though it does… make the more serious and dedicated teammates rather confused when the 2nd grade reinforcements arrive…
So…
Should these kinds of lineups become a… standard, of sorts, in realistic battles? If not for Premium users, who have a premium tank as a main, and a second one as the techtree variant best for researching whatever is being researched at the moment, but for average, non-premium players?
I think entire way of how research is done has to be reconsidered. Maybe make it so, that a bit of research points are collected for all the vehicles that are related in a techtree (say, You do play with flakpanzer 1 a bit, and although You don’t research flakpanzer 38 (the next vehicle in the tree), you still get some progress in it). And if flakpanzer 38 is researched, the research points go to it’s modifications. If it’s also spaded, they go to the next vehicle, and so on.
Another thing, that… research point bank can only be used by spending golden eagles, which… is not usually accessible for average players.