As far as I can see there is no reason why logrotate shouldn't be used by a user account. One can pass an individual config file and then use it to rotate log files where the user has write access. Therefore I think it makes sense to have it in /usr/bin, not /usr/sbin. Can we change the dosbin to dobin?
Thanks for the report. No problem in changing it. I'll bump the package in the following days (quite busy right now)
Done: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=bc23def39c3c70c8ee0eae0f0d9ce77dfb4169d8