Thoughts on retractable leashes for recall training?

This might sound like a really stupid question, but my main focus lately has been recall training… for the sake of upping difficulty I’m looking into going from a 12’ leash to a 30’ leash. Is there any downside or reasoning not to use a retractable leash for this? I know keeping no leash pressure can be important, so I wasn’t sure if a retractable keeps more tension than what would be ideal. If not, the idea of not having to manage a 30’ leash freehand and just going with a retractable seems ideal.