Lot of skills missing for different classes, i.e. seyan doesn't have GC listed among others

I can see it on my seyan, below heal and above regenerate.

What character is missing it?

Are there also others missing?

Remember the order is different to when you cast ID.
I think the ID spell is sorted whilst /max is just in skill number order.

/maxt 21 -> Necro.
Necro has curse and stun on maxt. Max 0. Slightly confusing. More max 0 values.

No curse 2, no blind. No wand, no shield.
No imm, no sh, no sh2, no dw.
No undead companion, no skeleton companion.
No rest, meditate, concentrate, regenerate.
No professions.

/max is the player command to show you what your skills are and it only shows you the skills that you are able to get.

/maxt was a builder command with a different purpose. It showed all possible skills and what their levels were and the difficulty level.
The audience was creators not players as players do not need to know about templates and difficulty levels.
The best solution is to remove this command from the player as it is causing confusion and it has a different purpose and a different audience.