You haven't seen it when it is buggy, crash crash crash, all I get.Do you know what you're talking about?
I've not had one crash related to Ars Magica on 1.7.10, and can only think of a two bugs, one to do with its power net that iirc can be fixed by changing from default settings and the other related to it's soulbound enchantment not working correctly(and destroying your items upon death) in the End. I mean, I don't know that it fits in here(though it does have some pretty great if unbounded PVP potential) but saying it is buggy and crash prone is not really the reasons it shouldn't be in this pack.
You are right that it is mainly about PVP and is multiplayer-oriented. It has mostly mods that give you weapons and armour (ex. Flans).So what even is trident? I know it's a new pack, and it's multiplayer-oriented, but I don't know anything about it besides that. I don't even know in what way it's multiplayer-oriented. Though from the 'skirmish match' comment I'm assuming PVP. Does anyone know anything else about it?(That you're allowed to say) Or has it all been kept secret?