Honestly I don't think that parallel stickers are a bad thing. For me the World Cup 2022 was actually easier to complete the album, because I swapped my extras for a good amount of regular stickers, as my goal with the stickers is to complete the album, therefore less money spent.
Also, I think for us (the ones who try to complete the album) the "hardest" stickers (even if they are not: messis, ronaldos, etc) became easier, as the greedy investors are not chasing those anymore.