Oh, ofc, but if we're talking about if someone wants to (for whatever reason), use specifically Pissorf as the glyph of choice, what I described is how you use it. Anything specfic you tack onto that past the point of glyph choice is up to personal preference, but the glyph works how it works - you move a few things if necessary and play anyone like a semi-assassin. That's elementary dedicated pissorf spellcasting.
As for it being better than fireball - it's simple. If you want to make an effective pissorf guy into an effective fireball guy, you have to add stuff. If you want to make a fireball guy into a pissorf guy, you can subtract stuff. Pissorf just does more with less. Going above what you need to be a pissorf guy, which really isn't much, is absolutely just a matter of personal preference / map layout specifics if you're looking to spellcast vs. a map. Pissorf guy needs one mana on top of extra mana (or 3 over 13), and the glyph, everything else is highly optional/overkill (and I do mean everything), if your spellcaster needs more than that, you're playing a worse spellcaster. Probably quite fun, possibly better suited to someone's personal taste, potentially better against some specific situation, but it's not a stronger spellcaster. Pissorf might be boring, or not give proper sense of achievement or agency to some people - myself among them, I'm fully aware of just how basic what I'm doing with it most of the time is - but that's how it is. If rolling something very quickly with spells under PQI restrictions is what I have to do - pissorf wins the cheeze race (often not just vs burndayraz since it's bugged). Not the prefference race, not the thrill race, or anything, if I overload it fails the sense-of-achievement race hard and makes me depressed, I'll play 15 fail Gnome Pyro's vs Naga City in a row if I want to to mix it up and have a blast, but it does win the cheeze race.
These days if I prep for prefference I prep up a Dwarf Warlord. They have a very nice blend of "complete win" and "sense of achievement" for me, it seems. Pissorff is for fast forwarding redundant flames, highly brutal PQI combos and picking up vicious PIQ badges, mostly. And that's mostly because of the bug and because the Crystal Ball is too damned good vs. too many badges, and Binlor is too damned good vs. some maps, and that means I'll either have the glyph anyway or i'll have the ball, and it's the easiest thing to use with the ball. A month ago I played hardly any pissorf, it was TT firebal spellcasters, halfling berserkers and such all day every day. I do enjoy using pissorf with guys who naturally have it as their glyph of choice, like fighters, which is to say that I like some actual strats with it. But I played a fair bunch of guys who're pre disposed to it, like assassins, in other ways, and when you consider how good Orc Bloodmages are with Pisorf you could also notice that I tend to play a lot more pyro friendly ones by preference and avoid Orc ones most of the time. So I privately enjoy some specific pisorf strats, but not all of them. What I described, though, isn't a strat and I'm not especially biased towards generic pissorf play in any subjective way.