[2020] Loser of LEC finals will have 33.3% chance for much easier group then winner of LEC due to Worlds main stage having teams split in 4 pools now

The sentiment of "if you want to win the whole thing it does not matter who you face" always comes up and while I understand where it comes from, I also think it heavily underestimates the impact of luck in any tournament win in sports. Of course some involve less and some more luck (SKT in their prime did not really need luck), but dodging the heavy hitters so they can throw themselves out of the tournament matters a lot when the competition is close.

Edit: This has become more important recently since there are more competitive teams in Groups (LCK/LEC/LPL). Previously, if an LCK team had a bad day/week in Groups it was fine since a bad LCK team still usually beat anything but an LPL team. Now an unfortunate 1st or 2nd round robin (either due to own underperformance or other teams' overperformance) can easily cost you a QF spot (see RNG, they would have made it with an easier group and who knows what damage they could have done in Knockouts last Worlds).

Not if they are throwing each other out of the tournament first.