I hope you are aware that mainstream support for 7SP1 ended just about a year ago…
Correct, but extended support still has near enough 4 years to go. When that hits, that'll be the nail in the coffin for Win7. Extended support essentially means no new stuff for the OS other than security patches. Which is fine.
Personally my biggest beef with Win10 is the forced Windows Updates (my PCs run 24/7 and I can't afford them to reboot when MS wants it to, so I disable WU totally outside patch Tuesday). UI differences are still providing some pain but that's standard for any major new version of any software.
Systems at home are a 50/50 mixture of Win10 and Win7. For the uses they have I don't see any need to update more Win7 boxes to Win10. They will be obsolete by the time Win7 is unsupported.