LOL! Gear is really complicated. Yes. There’s nothing wrong with a simple, two channel system. Maggies should really sing with tube power, just not loudly.
Excellent choice. The first thing I suggest doing when you receive it is to do a factory reset. I didn't see how to do this with a quick search, but it should be available somewhere. That will eliminate the possibility of any weird settings by the previous owner causing problems.
That would probably be my #1 suggestion. Also, look for a deal on a Marantz AV8802. Both have a bunch of features you won't use, but will have the superior two channel audio you're looking for.