You can shorten the flags in PowerShell simply by writing less of the flag - as long as you write enough to be unique and unambiguous, it will work. Get-ChildItem -R will map to Get-ChildItem -Recurse because there's nothing else it could be.

But if it does clash, you get an error, so really when using this you press tab to demonstrate either that you have a uniquely short string and it autocompletes to the full name, or you press tab and find you don't have a uniquely short string and then tab through until it's the one you want and see the full name.

There are short parameter aliases, e.g. -EA for -ErrorAction which are not unique substrings, and you can define those on your own cmdlets and advanced functions, but they seem less common.

And it would be possible to enforce some of this with a style checker in your own scripts, because you can introspect cmdlets and advanced functions to see what parameters they support, and make sure your invocations always use the full parameter name. I don't know if any checkers do, but VS Code with the PowerShell extension will style check your scripts.