Stick with 7 or even 8.1 as long as possible, even if 10 is offered for free.
My two-cents worth.
Agreed I will still have 7 for a while longer, windows 7 professional 64-bit works wonders for me and I have a gaming PC so I do not see a need to change it for the next couple of years maybe and I do not see win 10 hitting a very large scale enterprise environment that I work in for at least a around half a decade to a decade, and that’s a huge maybe, I will still play with it though.
I have been running “Windows 10” along with Windows 7 (different machines) since November 2014.
I don’t agree with your advice.
Folks who want to try “Windows 10” can download it, right now, from Microsoft. It’s officially “Beta” software, but I haven’t run into any serious glitches since January. Microsoft pushes updates regularly.
I'm running the technical preview. One or two things are a little goofy but everything does the job or works exactly the same.