While the merits of combining DOS and Windows is economically debatable, the memory layout of 95 is really well-thought out and DR really didn't realise that certain programs would just "slide" out of their allocated memory range even theoretically no programs should do that (there is already a warning in beta versions that has tighter memory layouts, and DR conveniently forgot how changing the DPMI implementation, even though it should just work, actually isn't). Microsoft is simply trying to minimise problematic applications at the expense of memory consumption.