You are correct.
One follower with 10,000 SP that interacts with you is better than 10,000 followers with low SP that don't interact with you.
I have been doing mostly R&D with this account. Possibly, it may have been a better idea to make multiple profiles where each profile is dedicated to one aspect.
I have been using this profile for my Utopian.io software posts, contests, barn renovation photos and a follower rewards project.
Most likely, developers that are interested in my Utopian.io software posts will not be interested in the contests or follower rewards and vice-versa.
I think you are right about that. If you really post about different topics, it might be better to use several accounts. That's basically the reason why I don't post about everything.