Devices do require brain synchronization in order to properly function, although I don't think that most Devices are capable of actual 'telepathy.' But yes, Loki is ... rather heavily cut down; it's basically a lot like Laevateinn in that it's "Supply Power, Turn On, Get Effect." No defensive auto-casts, no Cartridge System, no magic assistance ... just the Armor. Of course, that's all Flan really cared about
Yeah, Nanoha did a lot of her training/practice in her head during class. Apparently she's a magnificent multi-tasker.