Pyras do need a forward acceleration buff, that much is clear.
However, that being said, I personally am grateful for this current meta of not taking pyramidions because it opens a lot more options for tactics and loadouts as opposed to matches with 4 metamidions and silly dps wars. This is because those matches were boring for the most part. Now, because of the added options introduced by stamina and the fact that there is no longer a clearly dominant strategy (metamidion + hades/flak pyramidion) the game is a far more interesting and vibrant experience.
Pyramidion is not a bad ship per se in its current state, it just no longer holds the monopoly on tanking, ramming, firepower, and speed. It has been reduced from the clear best ship in the game to slightly less useful than the rest of the ships. It is a solid jack-of-all-trades, master of none, but it isn't massively underpowered as Ceresbane suggests. What the spire and squid buffs did, along with the pyramidion nerf, was make the game more balanced.
I stopped taking pyramidions after the nerf not because they sucked, but because I was so sick of flying pyras that anything else was an improvement. All Muse did was make the other ships viable. They did, of course, probably over-nerf the pyra, but restoring it to its former glory is definitely not the answer. Perhaps an acceleration buff and a top speed buff, but the permahull is perfectly fine in my opinion.