Not sure Hill's a good example. In and around the squad 3 years ago, fist cap in Summer 2018; then dropped, and worked on his work-ons.
Back in and around the squad 2020, 2nd cap Autumn 2020, when he played 8 out of the next 9 tests.
Unless you mean Ted Hill of course, who's in a position of real strength for England, such that some very good players were always going to miss out (same goes for Simmonds). While he (and Simmonds, and Smith, and...) have all improved since their time involved with the squads, the question remains - have they improved in the way that Eddie wants them to?
The "Good player missing out" I've obviousy seen the most of, is Mercer - who's also improved since his time with England, but not at the bit we know Eddie places above (almost) all else... so he's not even mentioned in dispatches anymore