It was to go with my flame stuff. Very neato.
The answers is - these weapons still exist, but standardised leader weapons are a great idea for insuring every leader gets the extra 'power boost' they deserve. Having them hardcoded means even if you have a deadbeat imm (tm), you still get a neat leader weapon. Even better - these ones have been arranged so they can't be stolen by other vindictive leaders. (and then placed on random mobs as ambush traps despite imm warnings to the contrary, you bastard).
If you still want one of these - sign up to a cabal that doesn't have a standardised leader weapon, and roleplay your heart out. There was an Emperor who got one. Scions have had them. It's not impossible to arrpee your way to such a neato reward!!
And no one has said they can't re-customise them. Maybe they simply haven't had a great reason to yet. From the looks of things, their names have changed on occasion already. (either that, or they have multiple versions of the same leader-slots weapon)
Yhorian