Any way to run Windows or Mac on a tablet?
What exactly prevents other operating systems to run on a mid-level tablet like Samsung S6?
Bootloaders, drivers, architecture, kernel extensions…
Through virtualization (Termux + QEMU), it should be possible. However, unless you're running Windows for ARM (no need for x86-64 emulation), you may get the performance of a Pentium III. Natively, though, those OSes simply don't have drivers and bootloader for your tablet. If you were a systems programmer, you could write those yourself and, after months of work, you'd have something like https://www.worproject.com/