I uspect that some, but not sure how many, don't understand the mechanic. If you aren't in the forum, I think its reasonable that sone people haven't noticed that the light trails are leading to anything.
The pre-bosses don't spawn really close to the center and aren't visible from it, and there are lots of little incursions popping up all around.
All of West Weald world boss and incursion fights are just a tedious slog. Immunity phases, adds, more immunity, some more adds, perhaps you would like another dash of immunity. . . they just drag out the fight endlessly. It doesn't take more skill; it just takes more patience, and after 20 or 30 times my patience has run out.
The day they remove all the unnecessary immunity phases from the mirrormoor incursions is the day I'll start participating more, until then I'll sit around until boss is at 45% HP and start beaming.