Windows 10 is actually a decent environment. It runs at least as fast as Win7 on the hardware I have access to. I do have one PC from 2004 with processors which don't include features needed by anything newer than Win7.
If you don't like the newer Start menu, try Open Shell.
I have not found much older software that Win10 will not run. The 32-bit version will even run ancient DOS software. New kit will ship with the 64-bit version, which is probably where the scare stories about incompatibility arise. Windows 11 does not have a 32-bit version.
There are scare stories about Microsoft collecting data about everything you do. To be honest, they do collect some stuff, but the internet is full of guides about how to stop this. Windows 11 collects a LOT more. Many of the people who complain about this data collection will happily carry an Android phone, which tells Google everything - which pub you had lunch in, what sort of transport got you there, who else was there (their phones' Bluetooth identities are logged and can be matched to THEIR histories) besides analysing emails in the hope of selling you to advertisers.
If you are running Win7, you can still update to Win10 for free - your licence is still valid. Search for "Download windows 10" and use Microsoft's tools to create a DVD or USB stick with the installation files. Then run SETUP on there. If you don't like it, you have a week to roll back to Win7.