For some considerable time now it has been recommended not to use JAVA (not JavaScript) as it is targeted (finding vulnerabilities) by malware.
If you haven't got a specific program or site that uses JAVA (not JavaScript), that you can't do without you are better off uninstalling JAVA. I removed JAVA from all of my systems some considerable time ago.
I don't know if win10 specifically blocks it, but I can't see it being a required program for win10. But on my win10 laptop it certainly isn't installed. It isn't so much a requirement of the OS, more a requirement of a program or site that requires it.
