First, the cost to prosecute a medmal claims is extremely high and is fronted by the firm. Second, firms prefer cases with obvious and severe negligence, which are rarities. Third, the firm is unable to form an opinion about either the likelihood or the degree of negligence. The latter group is the interesting group. It suggests that plaintiffs lack ready access to experts with a broad range of expertise.
Most experts limit themselves to a single healthcare profession, e.g. Nursing.
Or don't know hospital policies and procedures, or other standards of care. And many do not know federal regulations. The first step to evaluating a record is to reconstruct it into the form a clinician can use, not a non-trivial project. Then all sections of the record should be evaluated, i.e. facesheet, consults, the orders, progress notes, procedure notes, surgery records, allied therapy records, medication sheets, nursing notes, laboratory reports, etc. This evaluation should look at each profession that interfaced with the patient.