The reason Gaijin do not want more than 5 lines is the low screen resolution of the hardware of many players.Unlike expanding with more lines, simply having more 5 line trees does not interfere with their reasoning.
One click in an easy to understand nation based system is more than worth the possibility of improving the quality of current subnations and many future nations that would otherwise not be able to receive their own tree.
They are still combined. You can make combined lineups as you could now.
However a nation is not another nations property. Subtrees are supposed to be the nations collaborating, not one nation being owned by another. This system in my opinion makes this very clear by representing independent nations that can be brought together in battles in shared lineups.
Sounds like a lot, until you realize it’s not…
Japan for example is one of the smaller trees, yet when counting Japanese aircraft not yet in the game there is already enough to fill those 360 vehicle slots alone. And that is assuming anything can be put anywhere, while in reality the first 4 ranks have to fit disproportionately more than they ever could.
This is one of the smaller nations, yet there is already no more space for any subtree vehicles unless you take away from possible Japanese additions. Properly representing a whole other nation is completely unthinkable.
Now apply that to nations such as Britain or France, much larger nations in terms of available vehicle variety to add, both already having multiple subnations.
360 vehicles a nation may sound like a lot, but in practice it is not, especially when “a nation” is trying to be multiple.
It is, but that wasn’t Gaijins issue. Their issue was how intuitive it would be on lower resolution screens.
With this system you have a nice, convenient 5 line nation that looks as proper on any resolution and aspect ratio as current trees, with a nation selection that is no less intuitive on such screens either.