After some thought, I full agree to this line. Maybe I am just nostalgia blind, but its hard for me to like this game either way. I just see that it lacks variety compared to other titles due to lacking some extra weapon types, element circles, and removing some core abilites from some units. It's still the biggest problem I have with it, since I like a change of pace and changing victory conditions compared to just kill everything every time. :/
I said this before, but I have only two issues with removal:
-removing the magic triangle
-removing defend/escape
The former is more an issue with game balance than variety.
Everything else is pretty much a non-issue. I don't remember any seriously important extra weapon types or core unit abilities that were removed (all the essentials like killing edges, Anti X weapons, magic swords, brave weapons, extra range weapons, etc. are there. Only thing missing that comes to mind are reavers?). I wouldn't call it "slimmed down" at all.
IIRC Rout vs Capture always accounted for 99% of the mission types in almost every FE, and they were basically the same thing (kill everything, vs kill everything...then grab the gate/throne). So removing Capture is really irrelevant.
Escape and defend are the only true losses, and there are missions that emulate the latter in Awakening (defend emmeryon and tiki, and there are a few where you may have to rush to one side of the map). There's no true "hold out against infinite waves" type missions in Awakening, but then those were sadly underused in many of the games (I usually can't remember more than 3 or 4 at most per game).
Otherwise, I found the map variety extremely strong. I had to use a radically different strategy for each and every map, and even beyond that many of them had a ton of gimmicks that set them apart even on a superficial level (go from boats, to rescue, to castle, to volcano with lava floor, during the wallhart arc).
Like I said, "no variety" or less variety is a massive, massive exaggeration. It's about as strong as the past games in that department. A few steps forward, a few steps back.
I was kind of "late to the party" with Awakening. Picking it up after the initial release hype had died down. I wasn't sure what to expect, and quite frankly it blew me away with how excellent it was...especially after many other franchises I enjoy had been disappointing lately. I find it sad to see a good game get lumped in with "waifu/anime games" and trash like that.