I remember that at the time of Windows 95, I very often had to boot back to DOS 7.0 (which was also delivered as part of the Windows installation) to run DOS games, which were still very popular until like the middle of the 00 years.
And yes, when Windows XP came out (2001), people were somewhat disappointed that you couldn't simply boot DOS anymore to play your old beloved games. Over the years, DOSBox got sufficiently stable and PCs got sufficiently powerful that this gap could be closed.