More options to martial classes is OK IMO. Bring things that made monks good on 3.5e, bring 4e stuff that made fighters good, but don't cripple wizards.

Anyway, arcanists aren't based sole on Gandalf. They are based on myths and Odin is a might wizard and Galdalf is based on Odin, but compared to what Odin can do in Norse mythology, Galdalf is a weakling.

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Odin is able to shapeshift just like Loki, and he can shapeshift into an animal or human anytime he wants. Odin mostly speaks in phrases and riddles, and Odin’s voice is so soft that all who hears him speak thinks all he says is true. Odin can also just say a single word and he will be blowing out the flames of a fire, or tone down waves of the sea. Odin is seldom active in a battle but when he is, he can make his enemies blind in combat, deaf or horror-struck, Odin can even make their weapons hit like sticks, or make his own men as strong as a bear and go berserk.

Odin can predict the fade of all humans, and see their past, he even knows that one day Ragnarok (Ragnarök) will start and there is nothing he can do to prevent it. Odin also has the ability to travel to remote lands, in his or in the memories of others. Odin can send people to their death or give them an illness. Some Vikings sacrificed to Odin, and gave him good promises, in the hopes to gain insight into whether they could win a battle or not.
source> https://norse-mythology.net/odin-the-allfather-of-the-aesir-in-norse-mythology/

This looks much more strong than even what Mistra can do on D&D. Mainly when you consider that he isn't limited by spell slots... More options to martial classes is OK IMO. Bring things that made monks good on 3.5e, bring 4e stuff that made fighters good, but don't cripple wizards. Conan is a low Magic Setting and wizards can be insane deadly. Thoth Amon

"Thoth-Amon is a powerful Stygian sorcerer. He has many spells and rituals at his disposal. He commands beasts, especially snakes, and many types of insects. He has the power to corrupt and infest those who he has infected with venom; before they die, horrible monsters are spawned from their bodies. Thoth-Amon can communicate with others over long distances by possessing swarms of insects(...) He is even capable of summoning bizarre and terrible creatures to do his will."
 https://villains.fandom.com/wiki/Thoth_Amon
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But as i've said, there are tradeoffs

Complexity/Depth VS accessibility
Open world VS Linearity
Variety, Immersion and replay-ability VS Balance

BG2 has certain linear chapters and certain open chapters... But i don't think that balance is that important in SP games

For eg, an VtMB run as Nosferatu will be much harder than with an Tremere for eg, have seduction capped at zero and be monstrous looking in a game very focused on investigation, dialog and social life and being unable to be seen in the city without breaking the masquarede is an hard challenge. While other clans can walk into an club and with high seduction, get free blood dolls, an nosferatu needs to eat rats. While other clans can get discount from prostitutes, prostitutes refuses the nosferatu, run, screams on fear and breaks the masquarede. Even getting firearms and ammo become much harder. And the main appeal of a Nosferatu clan is exactly the idea of being forced to roleplay as an outcast.

Is unbalanced? Yes, but who cares? It increases the immersion, replayability, and variety on the game. Another example is Dark Souls. An Paladin(STR/FHT) would have an much easier time in the game than an swordsman that refuses to use armor. It makes sense in DkS world, it makes sense lore wise and it increases the replayability. Also, isn't broken on pvp. So, what is the problem? Other example? On Pokemon red, an CHILDREN's game. Those who start with Squirtle or Bulbasaur has an much easier time against the first and second gym leader. Is this a problem? Real life is not balanced. You can see how ranged weapons can be "op" on Battle of Agincourt. If fictional stuff exist, they will not be balanced too and as longs it makes sense in the fictional world, i an fine.