Then what do you do if you token dies for some reason (and/or new scopes and API endpoints appear) and you have to fetch a new token from the streamer? You spend two seconds adding the new scope to your existing web app, or spend ages plumbing it into Postman and manually fetching stuff between you and the streamer?
It’s not a good compromise since this comprise potentially violates the developer agreement you agreed to when you made a ClientID/Application.
But in the end it’s up to you. Just generally speaking the web app approach is easier and safer in the long run