fearsomepirate
Hero
I do actually consider the prep/known slot used up with spells like fireball. Its why playing a spellcaster can become widely inefficient especially when you're not well-suited for tactics and strategy.
I've disliked wizards in this edition as well but I recognize they can be useful especially for OoC stuff. Personally, I believe clerics are the best caster because they support much better than any other spellcaster with their mixture of great spells and features that can prevent the game from swinging too hard to recover.
People tend to default to damage because it's the lowest cognitive load (more damage is always better, requires zero neurons to analyze), Most players will typically opt to cast Lightning Bolt at a pair of enemies rather than upcast Hold Person, despite the subsequent flurry of auto-crits from the martials typically doing far more damage than 8d6.