Due to the lack of an actual U23 scene with U23 teams, I don't think you can/should deny WWT riders entry to this race. A rider like Nienke Vinke, who has joined a WWT team this year straight out of the juniors, is the perfect example of a rider who'd still benefit from a race like this,It's a joke that the first 8 in the ITT are part of the WT peleton - They should not be in the race.
While you have rising stars like Realini, Niedermaier, Kerbaol, Bradbury, Van Anrooij, Van Empel and Shackley, who are clearly too good to race here, you also have riders who might be on a WWT team, but who don't necessarily have the level for WWT racing yet, and/or who don't normally get many opportunities to ride for themselves at their trade teams. I don't think it'll be bad for their development to take part here.