There are two sides to that issue. On the one hand, the point of publishing research is to make knowledge available to humanity, so if you are having trouble understanding even the basic premise of a research paper (what problem it is addressing, etc.) then the authors are failing to achieve that goal. On the other hand, if every published paper was written to be accessible for non-experts in the field, papers would become longer and longer over time as lines of research progressed.

Unfortunately there is no reward for researchers taking the time to write tutorial and survey papers that give more readable explanations of particular lines of work.