They definitely spurred growth in this sector to the point where they couldn't compete anymore with the generic boxes from China. Beehive is a good option for anyone looking for an alternative.
IDK I love big OG towers where you can add anything and everything and never need to worry about where to fit your cooling. This obsession with fitting everything into smaller and smaller form factors just doesn't agree with me. Sure, the NUCs and similar sized boxes have their place in certain applications like libraries, office spaces, and the like. I'm not dissing the tool, I'm dissing the trend. With Apple pulling so many dirty tricks with their locked impossible-to-upgrade aggressively customized designs in both the phone and PC sectors, all in the name of small convenient packaging; and with a lot of other companies adopting the same design philosophies... IDK it doesn't excite me, not in the least. Sure, break out of trad ATX design, but in the other direction, make it more modular, make it bigger, make it easier to cool, and most importantly easier to repair and upgrade. With all the e-waste we produce, it's the least we could do.