Cap'n Kobold
Hero
Spellcasters have enough spells to be dropping AOEs with riders every round.
Do you honestly believe that anyone is suggesting that they do?Casters don’t cast 2-5 spells per round.
Not only is a caster much more likely to take longer during their action simply deciding what they want to do by virtue of many more options than a martial, but those actual actions tend to take longer to resolve.
No I'm sure that you do have an anecdote of a warrior player who took ages to decide and then resolve their turn, but those players exist for spellcasters too, which can slow down combat far more.
There is a wizard player in our game that is extremely snappy in making decisions and rolling for them, but it still took him about twice as long to resolve the last couple of combat rounds than the fighter due to the sheer number of attacks that he was rolling.