As a side note, I just finished the entire video from
@drop bear . Based on my own experience as a white belt bjj, I don't really see the need to grapple with those less experienced. I do see the need to get basic experience and defense against strikers, since that's how most people will react before getting close enough to grapple. But if someones in a state to grapple A: in theory by the time you reach blue belt in bjj (or equivalent in sambo/wrestling/jjj) you should be able to handle whatever they give you, and B: regardless of their level, there are so many different ways to react to each position, that if you have a lot of experience, you should know how to handle each. You shouldn't need to grapple with less experienced people to know their ways because, if they're effective, you would see more experienced people doing them as well.
That said, I am grateful that where I started training, they have everyone train together, I get how this might be more beneficial to me than purple belts, but it does give them an opportunity to teach, and by the time I reach their rank I believe I'll be more willing to help newbies because of the help I'm currently receiving.