Completely agree with this. If you look at some of the CERN infrastructure pages, you see they use both open source and commercial apps wherever they make sense. For example when I checked out the DB infrastructure a while ago, they seemed to use a lot of Oracle[1] (with some MySQL in there as well), Scientific Linux for some stuff and RHEL where needed ( presumably for support reasons).

[1] https://openlab-mu-internal.web.cern.ch/openlab-mu-internal/...