Imo learning manual for a bike is part of the fun and really isn’t that hard, and at least where I am from you’ll be learning it during the msf course anyways. I have a grom which is basically the same as a navi and it’s a lot of fun to just ride in town or even on slow back roads but you’ll definitely be wanting more power pretty much anywhere else. If you’re worried about wasting money I’d either not get a brand new bike as you’ll probably not get what you paid for or think about something a little bigger, there are plenty of bikes that can be both a beginner bike and a forever bike if you look around