var admins = users.Where(user => user.isAdmin()).Select(user => user.Name)

vs

    var admins []string
    for _, user := range users {
        if user.IsAdmin() {
            admins = append(admins, user.Name)
        }
    }

So, at the end of the day, these two pieces of code do the exact same thing, and have mostly the exact same meaning. I read them almost identically...

Make a list of admins. iterate through the users, if the user is an admin, append its name to the list of admins.

The unrolled version is a lot easier to modify later. What if you decide that each of these admin users should have a star next to their name? For the go code, you just add one line:

    var admins []string
    for _, user := range users {
        if user.IsAdmin() {
            admins = append(admins, user.Name)
            user.Name = user.Name + "*"
        }
    }

for the C# code, you either have to write a second LINQ query (and now you're iterating the list twice unnecessarily), or you have to unroll it into a normal loop.

So now you've added complexity to the language that is only really good for saving carriage returns, and it makes your code harder to maintain. Sure, it's pretty and interesting from a programming theory POV... but at the end of the day, I don't get paid to write pretty or interesting code. I do get paid to write maintainable code.