Doesn't matter if they are college kids or HS kids, they have an archetype that they like, one that requires them to not have to develop the parts that are extremely hard and tedious to develop.
You can teach and develop guys to throw harder, with more command, with more movement, etc. It's the other stuff that they make sure is already there before drafting guys and it doesn't matter if they are HSers or college kids. Just more often the college kids have that in each given draft than the HS kids.
And, to this point, they've catastrophically missed only 2 highly drafted HS arms since they've taken this on. In that time, they've drafted these HS pitchers in the 1st 5 rounds in the draft:
Justus Sheffield (consistent top 100 prospect until graduating, at the MLB level, hit)
Grant Hockin (2 times Tommy John, unfortunate story for a very gifted kid, miss)
Sam Hentges (at the MLB level, hit)
Brady Aiken (long story what happened here, maybe one day, miss)
Triston McKenzie (consistent top 100 prospect until graduating, at the MLB level, hit)
Juan Hillman (solid organizational depth arm that will pitch at the MLB level, though not with Cleveland, TBD)
Ethan Hankins (he's just as talented as Espino, and post-TJ looks strong, TBD)
Lenny Torres (another guy just coming off TJ, lot of talent, TBD but trending miss)
Daniel Espino (stud, top 100 prospect, TBD trending hit)
90% of MLB franchises would kill to have 33% of their highly drafted HS arms make it to the MLB level and contribute. They would also kill to have 33% of them panned as highly touted prospects. Cleveland has a good chance to make it at least 6/9 at the MLB level with Hillman, Hankins, and Espino. Only a matter of time with those 3.