Currently the revdev/checks/ directory is completely wiped out after revdep_check() is finished. I feel it is useful to see the full check log when there are errors or warnings. In particular, when the installation failed, I have no idea why it failed. The summary only contains the log like this:

checking whether package ‘ANLP’ can be installed ... ERROR
Installation failed.
See ‘..../revdep/checks/ANLP.Rcheck/00install.out’ for details.

And ANLP.Rcheck has been removed.