I don’t have any trouble with setting up and running DOSBox (I’ve been using PC’s since the late 80’s), but quite frequently settings have to be changed on the fly or just before running a specific game to make it work right, and most people just don’t want that hassle.
And yeah, DOSBox’s system requirements are just ridiculous. Why is it you require a 1GHz PC to run a game that came out ten (or more) years ago? And forget about running anything that has a semblance of polygonal graphics in it.