To make things clear - Windows 7 is not today's Vista and Windows 10 is not an operating system - it is a service.
Let me clarify - Windows 7 is classified as a product - in other words - an operating system.
Windows 10 is classified as a service - and the OS part of it is part of the service.
Main difference is how different laws deal with this two types of classification. In Europe, as you purchase the product, it is yours - you can use it how you see fit as long as it fits with the End-user License agreement. And Microsoft can not change much the fact that it is an OS and it is a purchased product by the user. They can not turn W7 into a service.
As W10 is classified as service - you are renting a piece of software. You are subscribed to a service that Microsoft has complete control of. W10 is the biggest data mining creation in recent years. It is a essentially a virus disguised as an operating system. Even if you opt out of all data collection in the W10 settings - a huge amount is still collected - even keystrokes (all your account names, passwords, online-banking is at risk and pretty much everything). You can not stop Microsoft from collecting all data it wants - it even looks at what files you create and what is the content. You can search more in the internet regarding this topic.
If google and facebook tracks you in the internet - W10 tracks all you do. And there is nothing you can do about it. Even after all "hacks" are applied - like stop beacon W10, W10 telemetry killer, reg edits and all - it takes just a simple update from Microsoft to put everything back.
Windows 7 is the last true operating system. It is a product that you purchase and you have power over.
Windows 10 is data-mining service for Microsoft. W10 is not an OS - it is a service that you have no power over.
Privacy matters. Your computer is your own and should always be your own. Microsoft or any other company should not be allowed to do this. People should realize - privacy is important. If you say "I have nothing to hide" you are missing the point. It is a matter of morals and rights. If people continue to be blind to this - Net Neutrality is not the only thing that the world will lose - as a European I am glad countries put NetNetrality as a constitutional right.
Your computer should be yours and the way you use internet should be up to you.
People like me cling to W7 because it is a true operating system. Window10 is not! Windows 10 is a data mining service for MS. And all of you should realize that.
The moment Windows 7 goes - it is Linux time.