I've seen both uses of the term "native"; it's an overloaded term. Some use it to mean "native UI", and others use it to mean "natively compiled". I meant it in the latter case. I actually prefer wholly custom UI, as most apps do these days that are cross-platform, because it allows for very interesting user experiences. Of course, some people disagree, wanting everything to be native-looking and feeling to their platform, such as Linux apps all using GTK or macOS all using Cocoa.