Especially when the levels in between them are large levels. It took me nearly 3 hours today to solo from Moorcroft to Emberlight, and that was with skipping an entire floor, and at least half of another. Having a party makes things go faster, but even then you're looking at a chunk of time to go from one town to the next.
This is problematic because towns are the only place that you can 1) save your progress and 2) change your gear.
I don't think I'm alone on point 1, as there are a lot of posts about saving progress in levels, at terminals, when idling out and when leaving a party. People feel compelled to spend massive energy on revives to protect their progress as well. More frequent save points (towns) would help mitigate these problems, without creating awkward scenarios where people are caught in an instanced level after their party has moved on and the like.
On point two, unless we continue to dump all the same minerals into each gate all the time, the level flavors are going to change up more frequently than once every nine floors. The ability to adjust gear at more frequent intervals makes specialized gear more useful, which adds variety.
On the point of there being not enough towns to save your progress, I'm pretty sure that's not an issue for very long. Yes, it does take some time to reach new towns when you start off but I see this as part of the challenge. If you run out of energy midway through, start over until you manage to reach the town. I like how it is now. Plus you still keep what you collect even if you leave the dungeon, so it's not like anything is lost.
I say this is not true for very long because when I do runs to the core now, it takes me around an hour max on solo.
But hey, that's just me. Maybe I am crazy.