1. The level cap won't be 10, but it won't be 20 either. They're not going to change it based on forum posts, it will end up being a function of the content in the game. We've seen dragons at level 1 and 4, and I don't know of any kobolds.
dragons and archdruids on BG3 are lv 4. But people say dungeons & kobolds, not cuz there are kobolds in the game, but to mock low level games.
2. This should be changed to work with 5e rules. That will be more than what is currently allowed, but it won't be using 2e or Diablo 2 rules.
The rule that I mentioned is 3e but I din't suggested it to BG3, just said as an example of a rule which allow the necromancer to chose between quality. quantity and anything in between.
The summon cap on BG2 is 5 and is not present on 2e. IMO is a awful rule. You can command 5 powerful Efreets but not 6 weak skeletons.
6. Not something I'd put in the list of top 10 most important issues, and certainly not something I'd consider as something as contributing to "worst casting on D&D adaptations".
This is not that important, but you will spend dozens if not hungrets of hours looking into your char. So how he dresses is important IMO.
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About lurker of the deep WLK, I would love it despite being unlikely to see a UA class into the game, mainlyu cuz how much water is negleted in RPG's in general. On BG2, you can summon Efreets, Djins but not Marrids. On NWN2, they destroyed Chilling Tentacles invocation...
I mean, I'm all for better robes that don't look like a collection of my granny's night dresses (you know, maybe even versions with PANTS!) but I'm not really sure I'd take Gothic, of all things, as a model of the concept done right.
Well, if your grandma has an dress with Beliar's symbol and demoniac inscriptions, then she is probably a Witch. hu3hu3hu3 just kidding. Don't take it seriously.
But I agree that Pents would be more appropriate.
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Yes, this is the kind of thing that spoils the fun of necromancy in The Elder Scrolls, and not only there. We need more undead, to do it so that there is a balance and a limit depending on the power of the wizard and not just "1 skeleton and that's it" is not difficult.
There are mods to allow multiple summons on most TES games.
IMO the best games in summoning mechanics are Geneforge which is a game ONLY about artificial creation of life. And G2 - returning 2.0. You as a necro can reanimate a huge army? Yes. But you need to maintain then with mana since they aren't natural creations. The strongest demon which you can create require that you learn demonology, higher demonology, gather a lot of reagents and improve your spell by a lot with expensive reagents like demoniac essences(you need higher runestone, demoniac heart and some jewelry only to make the spell) and then, costs 30 mana per second, the same cost of spear of darkness( circle 3 spell) per second. Having a small demoniac/undead army can make you waste all of your most expensive potions in a mater of minutes... And note that mana potions on G2 - ret require that you finish a drinking animation and then, regenerates your health/mana slowly, only the most expensive potions regens instant after the drink animation. The mana regen skill regens even slower and require 10k gold and second magical circle to Vatraz or whatever is instructing magic to you to teach you. There also was the risk of losing control over undead. But it was buggy and removed.
Of course, this can't work in a game which uses a completely different magical system, like Vancian and adapted 5e Vancian is.
5e sadly doesn't have all epic creatures which you can reanimate as a necro.
My unique fear is that an summon army will destroy the game speed. MAybe implementing a "concurrent turns" for then could solve that problem.
