The problem is that as of today, there is no mainstream or reasonably accessible/affordable display cabinet that is as minimalistic, relatively sealed, and put together as a detolf.
Sure, one is welcome to argue that they don't like the detolf due to personal tastes; below I'll mention why I dislike most curios. But I want to remain objective for the most part here. From a core standpoint, these are really the most "straight to the point" shelves which provide the greatest viewing capacity for your items while combating dust, fingers, and the like.
The average curio cabinets are too often bulky, having excess wood framing with bulky support beams between the glass panels that just block out your collection. Too often does the curio think it's the center of attention, not what's in it. I don't need to dip, duck, dodge, and dive around the cabinet just to see things in it. In my opinion, most curios I see posted present as something picked up from a garage sale which used to house Grandma's plates. It just doesn't aesthetically match what we try to display in them. But that's just my take on it.
With moderately roomy dimensions per shelf and a neutral style, you can display approx 8-12 figs depending on their size per case (2 if tall, 3 if varied height figure rule, with rare exceptions, as my calculation). That's not bad for $60. With two Detolfs, that's up to 24 figs for $120 in a very minimal presentation. $7 more will let you weatherstrip it and you barely, barely ever need to dust inside.
I'm not saying the detolf is the best display shelving on the market, but it's the most complete one for a reasonable price that does three things: puts your collection front and center, keeps them generally safe, and isn't intrusive in most style living spaces.
Until someone comes on the market and can do that better for under $120, I don't see a better option. Moducase is out there, but they are awfully expensive; to roughly imitate a detolf you're into almost $1k. There are some nice open shelves on the market, but then you sacrifice the protective aspects. Dave has open shelves that look good, we just rarely see the wide angle!
Short of custom building cabinetry, it's just too hard to beat that.
What boggles my mind is that Ikea has not introduced the detolf 2.0/XL, the detolf successor, or built a system around the detolf. The besta is the next thing, but those have only one viewing angle. Imagine ikea bringing the same pick and choose modularity to the detolf, based on 1, 2, or 3 unit wide bases. Maybe offer sliding door options for the larger model. And then whatever you can imagine to customize the system.
But anyway. Don't forget to customize your shelves with acrylic cuts from some of the aftermarket guys. It'll let things transcend one level in your shelving and it looks good.