I must admit I had a lot of trouble with shoulder pain until I got this one right. Still have trouble if I go too heavy too often and don't keep maximum concentration on form.
The consensus is scapulas retracted, back and downwards,stabilises your shoulders. Shoulders high and up towards your ears you are more likely to impinge your rotator tendons, because you are lessening the space between the top of your scapula and the point of your shoulder joint.
Alot of this stuff is genetics, regarding what you can get away with, some people have trouble, others can bench shitloads with bad form and never seem to get shoulder pain.
I suspect you lack of shoulder pain is just from employing a different pathway, to the one
you usually do. You may get away with it in the long term, you might not.
If in doubt drop the weight a little for a while and get good at doing the scapula retraction whilst you bench.