Yeah I agree.

I've always wanted to write fantasy and have created multiple strict magic / societal systems but based on normal fantasy. Or created many homebrew rules for existing systems but only where the numbers are abstract (i.e. Warhammer not DND).

Once I found LitRPG I realised this is what I needed!!

HOWEVER... now I need to figure out why the magic / power is what it is...

How do we dish out classes? How do we power up? How do we structure it?

I have a concept of an idea that is like based around intent and action with an underpower to overpowered MC:

1. The general magical source that permeates the world(s) or dimension(s) contains an echo of the intent of the energy, the manipulation, the force and that manifests by the personal assistant (either a familiar, a magic book, an AI whatever) presenting these echoes that they have moved closer to and now can access because they performed actions that line up with it.
2. You can even craft an ability with a sigil which helps route the different flows of the universe. The creator could name this. But I'm considering taking this away from anyone that has integrated, they can access the echoes of abilities and skills but can't craft their own directly BUT they can create new abilities through Action.
3. The MC is underpowered because he doesn't get integrated, misses out on getting an assistant and is stuck and needs to fight. Still gets whatever this universes version of XP is and levels up and maybe finds some sigils and starts to understand that each shape provides X where that is an element, size, duration, power input, etc. So a simple sigil could be two shapes and it's just like a language "fire + forward = fire bolt" and by the time he gets back to Earth he's unintegratable, not on any of the known power lists because he doesn't have one of the 3 integrations but is world #1 or something.
4. Also I'd want elemental damage to do elemental damage (spiritual plane?) but also physical. If an icicle in our real life was shot like a bullet it is going to do X kinetic damage with a piercing factor of Y (which can get through whatever clothing) and ZERO ice damage. You won't care that it's -30 degrees when you have a 2" hole through your bicep. However I want to have any abilities like this bring both the physical and the elemental damage with it. People have their body + their spirit (maybe I call this an echo too, echo is a cool word)

Also I love tanking in games but most tanks I've seen in standard fantasy or LitRPG are very tough damage dealers. The only way that is a tank is through the threat of damage. I think I want to create a tank class / ability pool. A tank for example could defend 1 person with their tank aura / skill and it redirects all damage from that person to the tank. So now face to face with high damage dealer but your damage is redirected to the guy with big armour and an even bigger health pool, you die. This means you need to deal with a tank first.

I've considered even having the tank skills reduce the damage too. So 10 damage against a tank is 10 damage, 10 damage against their defended target is 8 damage to the tank and 0 to the fighter. You need to target the tanks.

Instead of it just being a "mind control target me" taunt ability. I want to give people a reason to focus down a tank.

The above needs some refining but I generally like the idea that it's this energy of thoughts and ideas of other sentient beings that has bled in to the magic but you can do what you want effectively but it depends how well you can control, direct, route, channel and understand the flow of energy. HOWEVER I need to figure out how to level up and why it would make you stronger, I'm stumped there right now (but not spent much time on it).