Carronade/Flamethrower seems to be a more popular build now because it's even easier to pull off.
I 100% agree with this, carro flamer is my main pyra build and I am sure most pyra pilots over level 30 use a similar build more focused on disables for when flying pyra
Metamidion is one of the easiest builds in the game because of its reliance on pure armor/hull DPS. In a head on engagement up close of course pure DPS will win in a game about killing things when no other factors are involved. However, this does not make the metamidion the best ship in the game, just an easy one
I have flown about 2/3 of my matches as pilot on a pyra, and the majority of those were disabler pyras like flamer + carro, so I know what a pyra does well and what it does poorly.
So if you are in a lobby and see a metamidion don't just assume you will lose because there are plenty of anti pyra counters including:
-Sniping (gats have a very limited range, and most maps in the game are viable for sniping)
-Disables (main engie needs to repair hull and engines, so take out their engines and now they are either dead in the water or armorless)
-Balloon Pops (pyra does have a hard balloon to hit, but a good lumberjack/carro gunner can really mess up a meta)
-Double gat mobula simply has more DPS than pyra, although you are weaker in armor if you are smart about positioning and attack from a pyra's blindside, then they will be dead before they can even turn to face you
-Good Piloting (I know its tough to say this is a counter to a build, but any skilled pilot can easily out maneuver a pyra with almost any ship in the game
-Practically every pilot tool in the game (just use hydro to dodge pyras, or tar to disable pyras behind you, kero can let you outrun them if your ship is fast enough
In conclusion metamidion may be very easy to fly, but it has way too many counters for it to be called the best or most OP ship in the game