You can connect the GTKC to an interface at line level. Just switch the Main Level Line Select to +4dBu and connect using a normal TR cable. But if it works the way you’re using it and it sounds good, then there’s no problem. Just my opinion. My situation is that I’m thinking about starting an Indie Label so I can’t leave anything to chance when distributing songs and albums.
Yeah it’s more than sufficient for practice at home and demos. It’s super handy to know though!