For a 2D stratic game i expect NO loading times, period. At the very least no interior loading.
Why would you expect that? The file sizes on these maps are quite large. A lot of them are over 100 mb (as an aside, Wasteland 2's are far bigger).
You want lightning fast loading times, you have to accept late 1990s/early 00s-sized maps.
Wticher 3 loads three time faster, i mean come on.
Witcher 3 has a very long loading screen every time you start (that it tries to hide with recap narration) and is able to stream near everything else from that point on because it's 3D. You can't stream prerendered backgrounds.
As far as I remember, fast travel loading is about as long as Pillars, but it's still faster than the alternative so people accept it.