John Fairbairn wrote: on the evidence presented here this "totally wrong" is totally wrong.
If you read the discussion again, then you will notice that it refers to the number of players in relegation. Since the evidence is 5.6 on average, "very large number" is totally wrong.
You have conflated two and here ignored the other.
I do not participate in unnecessary meta-discussion.
I'd expect (b) to be the most important reason for many people. The EGF rules committee appears to have taken the stance that the system is the most important thing and the players are there to serve it, even if it means losing a day off. I imagine most people attending feel rather that the system should be there to serve them.
Here you write as if relegation games affected all congress participants. They affect 5.6 players on average.
Since attendance at a congress is basically a holiday
Presumably there are congress participants for whom that is so. There are also other participants for whom it is a combination of holiday and tournament play. Yet other participants consider the tournament play to be the major aspect of their congress holiday. Top players have yet another consideration: Participating to strive for winning the title.
It is only for the latter for whom relegation games can become relevant at all. That such participants belong to the latter group they express by signing to play in all rounds and wishing to play in the supergroup. Strong players not striving for winning the title do not need to enter the supergroup, and this has sometimes happened. Almost all are very eager to enter the supergroup though.
For players striving to win the title, you put up the consideration whether the players serve the tournament system or whether the system serves the players. Since those players are striving to win the title, a system that determines the title well is important to them. At the same time, the other direction also applies: Players do not want to play 18 hours per day in the championship. So surely there must be some balance. It is different for every player. Some strong players play in every tournament available - others play in only the main tournament. Some strong players play in Wednesday side tournaments - others don't. Therefore a general impression, which you try to paint, that strong players would per se not want to play in tournaments on Wednesdays is wrong.
There is good experience for how popular relegation games are among strong players: The Toyota-Oza-Denzo-Cup (or WTH was the name?) in Amstderdam was extraordinarily popular among strong players, although it had a dense schedule with relegation games after a heavy day during the evening before the first KO round. The relegation games were hard fought. From that, the most likely conclusion is: A tournament system with a profound seeding is very attractive for strong players.