I could not come up with a more empty, aggressive and subjective answer than that.Any deck except Thrive. All-in Thrive is probably the only deck that doesn't require you to do or watch out for anyrhing special.
And besides, the deck you are trying to criticize is not even "All-in Thrive", it runs 2 units with thrive, one of which every MO deck runs anyways, just like how Street Urchins, Savage Bear and Assassination (to name just a few) are staples in their respective factions (not to mention all the "Deal 4" with upside for 4 provisions).
Of course Endrega Larvae is overtuned, it should go to 6 provisions (like Svalblod Priest) if you want to seperately balance factions by their Gold, Bronze and Leader pool individually, rather than looking at the whole picture and the most important reason that Larvae was not yet considered to get nerfed is the fact that even with it MO are still around Tier 2-3.
Every matchup is diferent and you have to mulligan the right cards
play the right cards in the right order
keep the right cards to deal with threats
You are kidding me, right ?[...]
These "details" are something you just do in every match, it is not deck-specific.
You have to prep A-rush and not lock yourself out of it, Ozzrel, Yghern, the Beast, Glustyworp and different thrive engines, while preferably not getting blown out by tall punish.[...]
Example: Elves with Scorch - You have to prep Aeliren, Yeavin, Scorch, Isengrim, Oak, Scenario, Vernosiel...., thhere is also Blademaster, Purify, Lock and Dragoon.
There are also control tools and risky cards such as Golyat.
That should sound familiar, because in principle every single deck there is is easy to play and it is the matchup you adapt to that requires further thought (e.g. you would obviously play very different against Poison than you would against a strong long round deck).
In principle card games also require to be like that so that they can keep as many players as possible.
Nothing you mentioned above is fundamentally different from what you are criticizing as "braindead " and I am quite sure you are very much aware of that.
Edit: 4RM3D is generally right about having to play such a deck before calling it overpowered, I also used to see certain decks only from the outside (and think just how easily does it pilot itself, there is no skill involved whatsoever), turns out the whole picture was "a tad bit" more complicated than it appeared.