Is Exec Permission Useless?

I think it funny how you can use Windows as a POSIX environment which is not that different from, say, Linux until it is different

With Windows you don't need to chmod +x a script or other executable, but Windows has its own approaches to the the problem such as

https://en.wikipedia.org/wiki/Mark_of_the_Web

Not to mention Powershell execution policies which might lead someone writing software to be installed on random machine to "just not use Powershell". And Smartscreen, not to mention a code signing system.