Well, you know, that's just like, uh, your opinion man.
Philips isn't a part of the Hawks organization any longer so won't comment any on him. Without him, the oldest player on this list is Vlasic at 23. There are no 24yo in that group.
Speaking of Vlasic, sorta underselling him by a "solid top 6" which basically means he's a decent everyday defenseman. But he's more than been solid. For this season, his sophomore year, he's in the top 60 for points from defensemen, despite being way more of a shutdown defender
(The Athletic even had an article this time last year calling him the 2nd best shutdown D in the league after Gudas) , and he is logging 1D minutes this year. He's not a solid top 6 guy, he's a solid #2 defenseman.
It doesn't sound like you are a fan of Levshunov, and that's quite alright. But between what he's done last year in the NCAA, what he's done this year in the AHL (top 3 in SOG before the call up despite being the youngest defender in the league), and now already playing in the NHL in his D+1 season (with 5pts in 15 games), he's on a good pace to be a top pair D. Never mind the fact he's a big RHD that can skate, those types don't grow on trees.
Sam Rinzel, meanwhile, is a stud. Another big RHD that can skate (how we managed to get two of those, I'll never know). He's already averaging over 22 minutes a game (with 6 total NHL games) and looks to follow in the footsteps of Faber and LaCombe as the next great defenseman from the University of Minnesota. He is only 20.
The others on your list are closer to being accurate. Korchinski has potential but his career could go in a number of ways at this point. I like Del Mastro more than just a #6/7, but I'm not so high on him that I'm going to take the time to defend him. Out of Allan and Kaiser, Kaiser is more likely to stick in the NHL long term, but I'm not high on either of them and I have my doubts either are more than bottom pairing D in the future.
All in all, I think you are undervaluing a lot of players here. I can understand doing so for the prospects with little to no NHL experience. Every fanbase hypes up their prospects and it certainly doesn't always work out. However, it is weird how you greatly undervalued Vlasic, who has already made a name for himself in the NHL at the age of 23.