Maybe trophies for people who have never been above rating x (or currently under x, never been over x+y)? Add a requirement of 100 games or something if it looks like the people winning the trophies are mostly new accounts who get 500 points stronger on the next day.
This is speculation on my part but I think an idea is to get some players to identify themselves that weren't identified prior as known titled players and entourage known titled players to be more active on this site. The more active titled players that the lichess community contains, the better, imo.
I also think it's so that the Masters can have a really high-quality tournament where they truly are competing against each other, rather than competing who can berserk/beat the lower-rated players most quickly.
Unless you create trophies for every single rating level, there will always be people who can't get a trophy. The U2000 discriminates against 1600 players, who are too high for 1500, but will never beat 2000 players in a tourny. How about those under 1000 players? How do we reward them?
That's why they are trophies. Because they take effort and a lot of work to get.
I'm quite happy not having a chess trophy. If I want one, I can put in the work. Otherwise, just enjoy the game.
Sandbaggers tend to dominate lower rated tourneys. If I went into a 1500 tourney on another account or purposely lowered my rating I'd be a big fish, if I went into a 2000+ tourney I'd be one of the small fish.