I'm paraphrasing/selecting representative samples of your post; I think this is a fair summary?
These things are ~fair criticisms. As others have said, spellcasters are relatively weak at early levels, but get many more spell slots at higher levels (Wizards have ~10 spell slots at level 6, which is more than enough for a single combat). But, being more versatile at later levels doesn't necessarily justify having early levels be un-fun. To this, I reply that low-level spellcasters are at their best when using utility and/or long-lasting spells (buff allies, debuff enemies, escape from melee attackers, mage armor). However, Larian's changes to 5e have made buff/debuff/concentration spells much less useful, turning tactical-utility-spellcasters into inefficient blasters. Particularly the increase to goblin HP has made spells feel less effective even if they hit.
I've never played a game that had such a hard cap on spell casting.
You also have the perfect storm of hit chance being poor, and them not doing a lot of damage when they do hit. A Bow might do less damage than Witch Bolt, for example, but there's no hard limit on how often I can use it, so why would I bring a Wizard over a Rogue? Sure I can revert to Ray of Frost but I can't pin down a target with that, only slow them down and in my experience, Crossbows have superior accuracy for the same damage. Nor can I dip a spell, but I can a weapon thereby enhancing the damage it does. A Rogue is also less squishy than a Mage and because of the idiotic way they've implemented Sleep, a Mage is guaranteed to go out like a light, 100% of the time, when in contrast there are many low level NPC characters that are immune to the same spell. Due to the hard limit placed on spellcasting, there is no upside to having a Wizard in your party.
In short, get rid of the hard cap on the number of times a spell can be cast and replace it with a cooldown. If that means 'DOS3' then so be it. Better a fun game set in the D&D universe than a boring game that's a D&D adherent. At the very least the Wizard class needs to be rebalanced so low level Wizards aren't so underwhelming; and please, can we stop focusing on this single aspect of combat. Combat as a whole, is currently unbalanced to the point of being broken.
Crossbow doesn't have a better accuracy than cantrips if your characters are well builded.
Firebolt is 1D10, close to the heavier crossbow (same base but you'll add a modifier with the crossbow).
At level 5 Firebolt is 2D10, 3D10 at level 11 and 4D10 at level 17.
You're right about dipping, which is a new horrible, unbalanced and OP mechanic added by Larian.
Your caster is way more versatile and can control, attack, react, protect in many ways. BG3 lack of spells for now and reactions are badly implemented for now but a caster has many many PRO.
You talked about Feather fall... This is NOT supposed to be a spell you cast before an encounter. It's a spell you may
choose to cast as a reaction IF someone is pushed in a hole, spending a spellslot to avoid damages on a companion.
Your caster has attacks that can make way more damages than your non casters characters especially when he reach level 5 (spells level 3).
Are you really reading what's said ? You're stuck with level 2 spells for now and you already have many spells that can deal more damages than your ranged/melee weapons.
At level 5, which non-caster will be able to throw a fireball to deal 8D6 to any creatures in an area of effect ? (answer : anyone that has a scroll
in BG3, that's another Larian rule, or bug... idk).
No offense but It really looks like you - "think you know what D&D is" - "assume D&D is a bad system in video games" - because you played BG3 but BG3's combats are a cheap representation of D&D's combats. I even don't understand your problem with spellslots : in this game you can just spam rest to recover everything.
At the moment it's like DoS but without any cooldown...
I guess you never played any other crpg or tactical TB games except DoS before ?
There are tons of (legendary) games that uses the "spellslot" concept and there are many (great) tactical TB games that use something else than cooldown or mana.
