Is there a home in FXIV for the "Hardcore Endgame" Player-Type?

[Singularity]

It’s important to note that Ultimate weapons, while being technically better by 1 materia slot, are not meant to be actual BiS. Actual BiS weapons are generally considered to be the ones from Savage. The Ultimate weapons are basically bragging rights—weapon damage, main stats, and sub stats are all the same between the current tier Savage weapons and Ultimate ones.

Well... ultimate weapons are by definition "actual BiS". Unless you're using a definition of BiS other than "the best possible gear you can equip". I get your point though. No-one who does ultimate is doing it because they want an extra materia slot.