Please note we are discussing ranged caster role, keyword "ranged". In such circumstances range does not only matter, but is even somehow... crucial? Spells affecting multiple targets are usually refered to as "AoE"
Are you again arguing for the sake of arguing? That is not just boring, but dillutes the thread into junk
So you agree that my point is sound and "class spells can substitute destruction staff" is false, good. Rest of it is unfortunately only assumption tho. We have no indication that world skill lines would include any nuke spells for ranged caster. It would fit into Mages guild line, but thats pretty much it.
My own assumption is that those would focus on optional spells that are otherwise class specific, as Mages Guild spell Fire Rune gives non-Sorcerers alternative to the Daedric Mines
Back to my another point which was overlooked. As ranged caster you want ranged base attack as well, so weapon choice is limited to bow/resto/destro staves - there isnt really much of an option anyway