It can actually be very hard to install Windows 7 on skylake chip PCs, and Microsoft will end Win7 support early on skylake, so I do not agree you can just get Win 10 and install an old copy of Win 7 on top of it.
Even aside from this issue, installing an OS is beyond the abilities of at least 80% of PC users.
-It’s even legal since Win 10 Pro has downgrade rights to Win 7.-
10 Pro is rare on low to medium end consumer PCs because it costs like an extra $50.
Anyway I have used Win 10 for 30+ hours on my newest laptop and one of the office PCs I support. I still hate it, both because it sucks as an OS and because I can no longer replace my company’s aged PCs with brand new PCs with Win7, but have to basically find old stock Broadwell desktops. Regular office worker users who mostly use internet and office applications all day seem to hate it too.