>>45000854>Because it's only prominently used onceYes, and megas got two iterations, are part of lore bits that are still being cockteased in the games, and lasted over two generations in the main series.
Not to mention it still gets prominence in spin-offs.
It gets a little tiring of alolasperms/galards reducing megas to just a gimmick. Anyone who isn't a newfag remembers that they affected more than just battling, it was a complete change in lore that z-moves/dynamax haven't and will never compare to.