Windows Vista has had a bad press online. This was because it is not compatible with many programs written under Windows XP. However if you are using Vista on a machine will only has more modern software installed then it will be okay. Much software written for Windows 7,8,9,10 will install on Vista, so that’s a reason for keeping it.
If you have Vista should you upgrade to Wjndows 10? Probably not – your printer and scanner may no longer work. However your scanner will continue to work under Vista.
Check printer drivers, camera software and so on for compatibility with Windows 10 before abandoning Vista.