I don't see what use a "scrum master" is. That sounds like a small task for the software engineer or their real manager. There is nothing showing that heavy agile actually leads to features being developed earlier. In my experience it's the opposite as you build up heavy tech debt by micro-managing and optimizing for a 2 week return instead of the long term.

Waterfall were 1 to 2 year projects with heavy up-front administration. 3 to 6 months is well-balanced and that's what the "elite" companies and research groups tend to use. Two weeks is the current fad at non-tech enterprise.