I am not 100% sure, but I think in BG1+2 you could only cast one spell per round and a round was 6 seconds. There was no quicken spell or other meta magic.
In ToB you could become a magic machine gun with improved alancrity+robe of vecna, but it is so powerful because this ability is the only thing that breaks the one spell per round rule.
Of course there were spell triggers and contigencies, but then you had to cast the spell when creating the trigger.
I have played vanilla BG, not EE and no mods.
I have never played 5E, so I did not know that you cannot cast 2 spells in one round (action+bonus action)
Prof. Dr. Dr. Mad S. Tist
World leading expert of artificial stupidity.
Because there are too many people who work on artificial intelligence already
