^ I think you're undervaluing the benefits of being able to kill a lvl 8/9 at something like lvl 3-5 without actually investing resources into it while at the same time doing damage on the boss. Yes, it drops dead before the boss, but that means you ding. Then you just slam the boss into the next one, doesn't have to be a lvl9, can be whatever.
The Dwarf Tinker run in CO had me ding a bunch of times with literally nothing invested during the fight simply because I started early and stuff I was slamming the boss into kept dropping. Wheytwut the boss into the popcorn bowl - you'll never run out of stuff to slam him into. That's kidna extreme prepwork, but works fine with just 1-2 other things besides the other boss. And you don't even need Wheytwut for it.
But there's no need for a Pissorf contest, I'm not saying Firebal's unusable or anything, but that with all the other restrictions that keep people thinking Pissorf is a utility glyph, clearing up the tooltip would remove an unnecessary one, and having stuff around which pissorff doesn't work well on would be a good idea, because in practice it's way stronger than burndayraz (by a wide margin) regardless of whether it takes experience/skill/whatever to become aware of it / good at it.
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You could say I went all sinergistic with being an Orc and a EDIT: Wizard and all that, but I only used B2P like... 3 times. Regular difficulty and all that, but I'm lvl 2 and I got 2 lvl 10 guys waiting to be murdered. Exactly how could I've better invested my resources?
And I didn't even cheeze it, tbh. I explored a bit, wheytwuted 5 guys, converted some stuff. My base damage is lower than anyone has at lvl 5. And if I was just a level 5 guy with Pissorf and some regular spellcasting junk, I'd be able to have two high level targets popped with even less investment.
Extreme sinergy, yes, but also results kinda beyond extreme, and had I made a video of it, you'd be able to see that it didn't exactly take much effort. There's 5 guys in that dungeon kinda designed that at least one challenges whatever you are, except none of them challenge the pissorff guy (well, the phys resist guy would).
And again, I'm not calling for a nerf to Pissorff at all, just saying - if it's not being more widely used, it's probably due to it's tooltip on top of any inherent complexity to it's optimal uses, which is unnecessary. And I'm saying that there's room for a monster ability that puts a cramp on it specificaly.
Other things benefit from setup, too, Pissof just gives too much too reliably with setup, and doesn't really need that much setup most of the time. Here you've got to find and port 5 guys (eventually), you get nothing much from your gods (Binlor and Mystera, got a Refreshment off her). One would think it'd be more iffy, but nope.
Here's all all 5 of them dead and also most of the lvl 8-9 (well the ones I ran into anyway).

Most of the time it would take effort and resources to kill half of those high level non-boss guys, and even more often you simply wouldn't be able to kill a single one on a VT run. With Pissorf, they all just drop dead for free dings and XP, making Pissorf (even not especially sinergistc pissorf) probably the strongest thing in the game. At least it feels (an looks) that way...
If anything happend to lower it's power indirectly, I can't honestly say it'd be a bad thing or that it would lower it below "very, very, VERY powerful". If anything happened to the tooltip, though, this would be easier to pick up on for the average player. If the statistics are showing people prefer Fireball, or think of Pissorf as complicated, or think of Pissorf specialists "not being there" I'd say it's mostly because of the tooltips.