The difference between a good hire and a bad hire is really big, right? So why would you be like, there's no way I am reading 100 resumes?
Suppose it takes you or someone like you (i.e. maybe you can get in a room and do all the resumes with a few people on the team in an hour or two) on average 10 minutes to reasonably critically evaluate a resume, maybe follow and read any interesting links on it. Then the pile of 100 resumes takes about 15 hours to evaluate. Suppose that the person you hire has an expected tenure of 2 years. That means they will be working for about 4000 hours. 15 hours represents less than 0.5% of their productivity. So can it really be that critically evaluating the resumes doesn't even give you a hire that is 0.5% better in expectation? I would have thought it was like, 50% better, if the resumes are your primary screening tool to decide who to bring in for an interview!
I have been working for like 15 years, and all my coworkers are always just like you -- they don't read the whole resume, they don't go read the candidate's code, they don't read the candidate's blog, etc. But it seems self-evident to me that spending a few hours to try to hire better coworkers has a huge ROI for the team. The time I spend basically always finds stuff out about the candidates that my coworkers find interesting and important, and often prompts further interesting information in the interview.
I always just figure that the explanation is: my coworkers don't enjoy doing hiring stuff, and nobody is making them do it, therefore they don't. Do you think differently?