Although they may make 3 attempts, (as they profess to do), the recipients, if forewarned, would have an opportunity or freedom to say, No
make multiple attempts, when I am not
at home, and instead deliver according to one of the other optional and more convenient methods of the delivery agencies.
forewarned, then the first notice might be an inconvenient one to try to chase down where a package might have gotten to.
Recipients should have choices other than deciding which work days to take-off to sit on the porch and wait for “special” deliveries.
Some people like choices and freedom.