My answer to the lawn dart of a question, “should scrum master be a fulltime role?”…
A full throated consulting, “it depends.”
Saying a team is running Scrum and has a Scrum master is data without information.
Is the team proficient and performing? Is the scrum master a capable coach or just a facilitator/project manager. Does the org invest in learning, team leadership and continuous improvement?
It’s like a sport where most teams aren’t allowed to practice, don’t field all the positions, and are coached by an office admin. Then asking if that coach is necessary.
What value are they creating, what harm are they creating, what outcome does the team and org need, and can they learn and adapt?