No disagreement from me with what has been said so far, although I stand by my earlier remarks
My experience of learning groundwork within Aiuchi as well as previous jiu jitsu clubs was that even though we always state that self defence and jiu jitsu are not constrained by judo rules, I have regularly been taught approaches which are well suited to judo but not ideal for jiu jitsu. As one example, I was often taught that when a fight ends up in the guard position, then the person blocked by guard is in the weaker position than the person whose back is to the floor. I now see this disadvantage as an artefact of judo rules which prevent striking; once those rules are gone then the person on the floor is still in the stronger wrestling position, but is very exposed to game-changing groin and stomach strikes. Outside of judo, guard is often considered neutral, because both parties are strong in one regard and exposed in another. I have yet to hear this view articulated by another instructor - although that's not to say that this isn't being taught by some, I have only my own experience to go by.
Guard work is far from the only example, based on what I have seen in both club training and national events. My point is that even though judo has a lot to give to the student of ground based jiu jitsu, I believe that an over focus on orthodox judo created a significant blind spot in my own training for many years, and I believe my experience is widely reflected by others'. This problem is particularly compounded by the practice of sitting back to back and spinning into a judo ground duel in order to 'test' groundwork. This competitive scenario with sport-based rules becomes the one that we all want to learn how win - in my view at the expense of drilling important aspects such as creating appropriate distances for striking and for recovery to a standing position.