The last time I tried Dragon it was just a fancier (bloatware) UI built directly on top of Windows Voice Recognition (and IMO not adding much value on top of it): https://support.microsoft.com/en-us/windows/use-voice-recogn... Windows Voice Recognition has been around forever (out of the box since XP), it's UI is "serviceable" but not great. (It was slightly better when Cortana was briefly "out of the box" in Windows…
It works very well for some people; many have written books with it.