The only thing it doesn't handle is that sense of progression (that is, it merely mutes any sense of progression). It's kinda redundant, for instance, when you already have secondary roles.
Have you used minions much? It occurs to me they might not work out quite right. A minion jumps 8 or so levels in return for being a one-real-hit-kill. In 5e progression, 8 levels doesn't mean much, minions should probably be worth fewer xp…
...yeah, now that I think of it, xp & encounter guidelines are only going to work well right near at-level - as in 5e, lower-level to the point of trivial in 4e can instead overwhelm you. ...hmm....