This is quite subjective, but for me being in control of what I learn in SRS means I don't get bored. I am only adding things that I am interested in learning,

This is quite subjective, but for me being in control of what I learn in SRS means I don't get bored. I am only adding things that I am interested in learning, and if I become bored of something, I just delete it. It might sound counter-intuitive with the "remember things forever" side of SRS, but it is better to forget boring things than not use SRS at all.