Support for Windows 7 has ended
microsoft.com
microsoft.com
There is one huge difference, that's accounts. In 7 you get in with a password, but in 10 you can also use a pin. Also 7 has two types of account, administrator and standard. In 10 there are two more variables, Microsoft account vs local, and family vs other user, with a different procedure for creating each.
Also there is cortana, but I haven't use it except for the initial setting up.
Let me add that I have found David Pogue's Windows 10 The Missing Manual very helpful.
It is worth noting that a huge number of atm bank machines are running NT well beyond the days Microsoft was trying to get people to stop using it. For those who worked with NT and with what was replacing it, the decision was a no-brainer. Even at Y2K. Where is the cost going to be, and how much should we expect?
How many failed patches have you ever installed? That's exactly what they are avoiding. Risk has a weight. Denial of service is a risk, and in many businesses, the potential DoS is a more expensive risk than what the patch fixes. It's also the same reason employed COBOL programmers still exist.
For me the most valuable VM was one that ran Vista because it needed a certain compiler at a certain version that didn't run on anything else.