Let's say the lowest ELO for a (human) chess player is around 1250 and the highest ELO is around 2850. That makes difference between worst and best rated player = around 1600 ELO points.

As it is well known: 200 ELO difference (also refereed to as skill difference of a one "class") means that the weaker player should score about 25% of points while the stronger player should score about 75% of points. So that means out of 100 games

players with ELO 1400 is expected to win 25 games and losing 75 games against a player with ELO 1600. (we are ignoring draws for simplicity)

At 400 ELO difference the odds would be about 9 won vs. 91 lost game and so on.

So if chess used 4 tier system that would result splitting the playerbase in four large groups like this:

tier 1: ELO 1250 - 1650

tier 2: ELO 1650 - 2050

tier 3: ELO 2050 - 2450

tier 4: ELO 2450 - 2850

Where all players fitting into one particular group would be considered "about the same strength". That is at least what the QL tier system wants us to believe. However from the explanation above it should be clear that there would be a HUGE difference (400 ELO in worst case) between the worst and best players in one tier. It would also mean that in tier 3 we would have average club players together with international masters. Or in tier 4 we would have international masters together with the strongest of super grandmasters. And it should be obvious that none of this cases are even remotely "equal".

How does this translate to quake ? There may be differences between various game modes but basically I would expect the skill chain for quake (like the ELO difference between the best and the worst player) to be comparable to chess. You can speculate if this assumption is true or not but if you are willing to accept that skill chains in chess and quake are comparable than it also means that the main problem with tier system in QL is simply that splitting people into four groups - no matter how you do it - will always result in tiers where there can be up to 400 ELO difference between worst and best player in the group.

While for games to be "equal" you ideally need ELO difference around 100. Remember that Even 200 ELO difference in chess is considered a "class" difference in skill so even if skill chain for quake would be lower than in chess you would still end up with unbalanced tiers.

If you are asking why I am writing this it's because of two reasons:

1.) QL doesn't work again so I am killing time until it starts again

2.) It's my way how I try dealing with situation that QL devs opted for rating system which seems to be so trivially... let's say doubtful at best. And inherently flawed at worst.

I simply can't understand WHY ?

Thanks for attention.