Would grinding out China ease the Swedish grind

playing another nation for a while does yes

In a way it will help…you’d get the 5% research bonus for reaching the last vehicle in a tree so yes in a way it will help….plus you can think about the friends you would make along the way.

i meant more that it helps ease the nation fatigue and playing other vehicles teaches you how to kill them easier

And that because knowledge is key

What about planes

china has some amazing aircraft at all teirs pretty much

Same for planes, mostly US and USSR designed/derived iconic aircraft continuing high up into the tree (domestic air starts somewhat later up in the tree compared to ground).
High tier has notably unique aircraft in terms of capabilities and play style, with a long, long list of domestic aircraft that can be added. Entire families of aircraft we haven’t seen yet; there’s a lot of potential.