I noticed that apply_updates in /etc/yum/yum-cron.conf is set to No on a centos 
7 system while it is set to Yes on SL7x.

Is there any reason not to set to yes for centos?  I have cron job that emails 
the user assigned to the desktop to reboot their machine when updates have been 
installed. With apply_updates set to No, the job fails to detect the install 
with 'yum history'. I can fix this but I was wondering if there is some reason 
why I shouldn't configure the daily yum cron the same way, ie, apply_updates=yes.

Thanks.