It's perfectly fine to allow if in tags (the compiler can figure it out). In Mint you can do that no problem: https://mint-lang.com/sandbox/6lnZHiG8LVRJqA

    component Main {
      fun render : Html {
        <div>
          if true {
            <div>"Hello World!"</div>
          } else {
            <div>"False"</div>
          }
        </div>
      }
    }