You grossly over-estimate the time it takes to read a resume. It's way below 30 seconds per resume. Probably on average closer to 10.
Try it for yourself: set up a timer, open your resume. How quickly can you figure out how much experience you have, do the job titles match more or less the position, any description that lists similar stacks to the one your group uses? 10 seconds.
It takes 10 seconds to read a resume? So you just throw out the resume if you don't immediately see "similar stacks"?
I wrote "thoroughly" meaning reading the whole thing, and possibly looking at their links, or doing some small research about something on their resume.
Try it for yourself: set up a timer, open your resume. How quickly can you figure out how much experience you have, do the job titles match more or less the position, any description that lists similar stacks to the one your group uses? 10 seconds.