Charm / Friendly Summon

[Mark]

I'm curious why Angband (vanilla) has no spell which will charm a monster to fight for the player, or a spell that summons such a monster.

Is it because it would require (relatively) significant A.I.? (Sure its easy conceptually, but that doesn't mean easy to implement).

To prevent being overpowered, charming high-end monsters could be very hard, impossible, or only last for 1 -3 turns. Given charming a monster wouldn't give you loot, or xp, you could even have some easier Unique susceptible to it, for short time.

Charming monsters would allow more strategy, and could be used both offensively and defensively. They could become meat shields, or may have the right elemental attack to help you overcome a difficult unique.

It would be something that helps improve the mage spells only (not sure what has changed there in v4, but last I played holy prayers were 'better' than magic spells, in general, was the consensus).

If Charm Monster would be too powerful (in the sense that almost always it would become the best option available to a player with that spell, making it boring), perhaps we could have very limited charm spells - like Charm Orc, Charm Troll, Charm Person?

Anyway, I'm curious if this has been discussed already and if it has any merit?