Personally I’ve spaded barley any vehcles other than all the low tiers from like singular matches and the near entirety of rank 8 usa, I honestly only grind to the key mods then I just cycle through the aircraft I have at that point for fun. If I’m ever looking for this completion thing I just grind a techtree.
So personally I play what I want (usually top tier and grind a few nations if bored I’ve never understood the need to spade I assume after a while you become addicted to spading and become tiger_tank 1)
Sometimes I’ll play things I really don’t like, just because of a compulsive need to complete something. I’m trying not to, but it just happens.
But mostly when it comes to top tier stuff I play it because I’m interested in the vehicles outside of the game, so I also want them in game even if I don’t like the gameplay as much. It does help a lot though that just casual custom battles with friends can make just about anything fun, so even after spading them I can use these vehicles there, even if I’d rather play lower BRs when alone in actual matches.
I’d also enjoy top tier a lot more if stock grinds didn’t take so long probably. Because it’s taking so long, 70% of my top tier games are in sub-par vehicles with only slow progression to things getting better. Which in turn just means I’ll force myself to quickly spade X or research Y, then get burnt out and not touch the game in a week, get back in with some friends of low-mid tier matches I have more fun in, then repeat the process from before.