Their hype was the immortality. That was what made them a threat throughout egghead. Without that hype, they don’t feel threatening.
There hype was more than there immortality we always knew that would get figure out.
That why Oda show stuff like the all have CoC haki .
Topman doing biggest haki blast until joyboy and being tougher than Kaido and BM .
Ethan being speed demon and doing biggest slash in series or at least even with mihawk and laws .
Mars has bolo breath than he can spam that most likely his weakness attack and same for the worm .
Unless you are already weak in OP when your gimmick get figure you don't turn weaker .
Admrials that logia user not turn weaker when haki come about , Kat not turn weaker when luffy get FS , Kaido and BM not turn weaker when they could get hurt etc etc.
There loads of people that still hype to see elders fight just without this regen shit .