Lord god, why don't you want 5e to explicitly tell the DM what role the monsters have in a fight? Do you actually want new DMs to suffer, make lousy games, and quit?
5E can slap whatever labels on the monsters it likes. I'm all for providing helpful hints to novice DMs, and even experienced ones.
But what's under discussion here is having those labels affect the mechanics. And that's a problem for me. I want to be able to take the same troll and use it as a solo versus a 1st-level party, an elite versus a 5th-level party, and a regular monster versus a 9th-level party, without needing three different statblocks. It vastly increases the utility of the monster, and improves mechanical consistency so that the party which tackled a single troll at 1st level can anticipate what it will be like to tackle five of them at 9th.
I realize that achieving this while maintaining 4E's balance and tactical depth is a significant challenge, and it will probably require some form of "level threshold" or "hit point threshold" mechanic. But I think it's a worthy undertaking.
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