@PK-Persona : They where that way in DA2 for that matter. Even firestorm the fireball crap rained down 'immediately' while he played out what would of been a longer cast animation ahead of time. I'm glad they've put in some more ehh, tactical considerations with a front heavy cast animation before we see actual spell effect for some of these.
-edit-
Oh or can we cancel mid cast if we've already made the target? What if, say on PC where it's simple to hit a hotkey and click the mouse will there be some method to cancelling the cast prior to it going off? I kinda hope there is.
Oh and 1 more aside, not really to anything you said persona. But as far as a campaign co-op, not sure if BioWare would still do this bug BG1/2 and NWN both still have pause in MP. I think only the host could do it in the BG series (but I could be wrong, its been an absurd amount of years). NWN had server options allowing anyone to do it, just the host (or DM's) or disallow it all together. Kinda curious if they might actually keep the mode available to MP, perhaps requiring more then 1 person to toggle it at the same time (or well hold the button down)?
Probably not but who knows! Not us! Cause BioWare wont say anything. 