Hmm, I disagree with your take on it but this is a solid response. I will also say that my instructor started as a wrestler and has some judo under his belt himself so my experience likely hasn't been the same as many others with a BJJ base. He runs his classes with that wrestler's mentality I guess and during my early years of training, I was drilling double and single legs just as often as I was triangles and armbars. Hopefully as time goes on, we see more grapplers who've done nothing but BJJ running their schools the same way (although it unfortunately seems to be going in the opposite direction at the moment).
Personally if I was running a BJJ school, no one would ever be starting from the knees. If that's what you have to do then I think both people should take turns pulling guard. I think I might be giving the wrong impression too when I say I automatically pull guard if my training partner doesn't do it, it's not like I just flop to my back and let him start dictating the pace. I get my grips and immediately start attacking, I'm always trying to sweep right away. It's not unusual for me to "pull guard" from the knees and then be standing up with a single leg just a few seconds later. I just feel like that's the best way to go and that you're only hurting yourself by never pulling guard but hey, no big deal.
To be fair I see where you're coming from too and I agree pretty much with what you're saying. I do not believe that randori/rolling from the knees should be the only starting position but I think it can be a helpful part of a training program that includes positional sparing as a massive part (I include complient guard pulls to working position in these). You need positional sparring to train for the finest technique and you are 100% to point this out but I just think that knee wrestling and the scramble it creates can help you to identify quickly oppurtunities to use those techniques. Of course if unregulated and poorly executed knee wrestling is absolute dogshit, but that's the same for all training methods imo.