Yeah I'm planning on switching to Drifter once Ive finished maxing my (third) class line.
One restriction on keeping weapon arts is you have to use one melee and one ranged... I wanted to use the healing / support arts of the knife / photon saber paired with a damage-dealing Longsword, but that's not allowed.
On that note, what's a good ranged weapon to pair with a physical melee Longsword character? I've been using assault rifle because I like the topple move, but if there's a ranged weapon that has good arts for buffs / debuffs I might try that.
Most raygun arts hit all enemies in front of you, and the weapon has access to virus, blackout and debuff res down (I think the mind control and servant sacrifice moves are also raygun-related, but I don't know if they're actually attached to knives instead). For offensive moves, you get a gravity-based topple, two multihit beams that deal a lot more damage if you have an aura active, a party-wide gravity-resistance aura and maybe some other thing I might be forgetting right now.
I'm still levelling up other classes besides Mastermind, so I'm not sure about other weapon types.