I tried making a normal, plain DM once and failed miserably, but I can understand what you mean. Maybe one problem is that the userbase doesn't like (or simply can't) put massive or, or even decent, amounts of effort into making original, fun Deathmatches. It's also kind of hard!
Trying to do stuff like make a symmetrical mini-town can be more difficult than something like a simple, flat bunch of plates floating in the air thanks to all of the issues that could come with balancing and making things fun or workable, or even designing all of the buildings without making them all look like dupes. While the town could suffer from imbalance thanks to simply having a variety of buildings, a bunch of plates are ludicrously and shamefully easy to make and "balance".
