I would expect they get a lot of resumes to pour through. It wouldn't be feasible to point out specifics when a lot of the rejected candidates would be rejected

I would expect they get a lot of resumes to pour through. It wouldn't be feasible to point out specifics when a lot of the rejected candidates would be rejected due to numbers more so than weaknesses. Pointing out weaknesses also invites argument, and possibly even public goading, since these days so many people seem to enjoy airing grievances to "get back" at the company as if not hiring them was somehow (usually treated as obviously) inappropriate.