Consider too the specific effects that various spells *should* have on one's opponent. If someone is hit with a high level fire spell, should they just take it on the chin as if punched and keep hacking away with their axe like they are chopping down a tree? Or should they be freaking out and on fire like an ant under a magnifying glass? The same goes for spells that cause fear, blindness, freezing and so on.
This really. It wouldn't be very fair to have weapon attacks disrupting spells if spells can't do the same sorts of things back in turn. And I don't simply mean status specific spells that don't do damage, as weapon attacks would still do damage as well as a status effect if such a thing was implemented.
Also keep in mind that in the higher levels, there is no cap on max weapon damage whereas there is for spells, and it's also far easier to protect yourself against one or two magic ways than it is to protect yourself against weapon damage. Archery may have a larger advantage here as it has the range and the lack of a cap as far as I know, but I never experimented with it much.
But I really don't think weapon use should disrupt spells more severally unless damage spells can also slow the approach of an attacker or make them stagger somehow, because I would think a massive burning fist should be able to do the same as a weapon when it comes to this kind of thing.
I think balancing these combat mechanics is going to take a while either way sadly. Maybe we should all just resort to playing with those weird looking robots Rigwyn shared to settle these problems?