Captain Obvious time folks.
Thanks to browser implementations, many DOS games can be easily and reliably played right in the browser, even if a user can't be bothered to install DOSBox.
Some people still build and use retro PCs with real onboard MS-DOS or FreeDOS or whatever (I remember looking up other alternatives like Caldera OpenDOS and the like, but don't remember much, as I never actually tried them), it's certainly a niche thing not accessible to everyone but I guess it counts.
And yes, some specific mission-critical software runs in DOS so the businesses and institutions that rely on it have to keep DOS-compliant machines afloat, but here I hesitate to comment whether this is a good thing or not. Ideally software should be open source and portable to any modern platform without any detriment to performance.
Best platform for gaming? I have to admit that since a while ago, I'm very actively looking for DOS games specifically because I know these are effectively cross-platform thanks to DOSBox and almost certainly will run one way or another, whereas Windows 32-bit stuff from the late 90s and even early 2000s is often a hit-and-miss on modern Windows 64-bit platforms. But this is thanks to the tremendous effort of the DOSBox dev community, not an intrinsic feature of the DOS games themselves. In the mid-to-late 2000s many companies apparently gave up on their DOS legacy titles and even released some as freeware. Today, video game entrepreneurs actively buy out these old IPs to sell them via GOG or Steam bundled with DOSBox.
But there are limitations to what a DOS game can do, even on a high-end host system. I mean, everyone would appreciate a modern source port of CHASM for example. It's almost the same as with Amiga where the performance ceiling was reached at some point and "cool" games like Doom were not really possible, even though some years before that Amiga could boast certain advantages over DOS, e.g. a richer palette etc.