This is on the agenda for Friday's FESCo meeting at 15:00UTC in #fedora-meeting on irc.freenode.net, but note that we may not get to it as there is a large agenda and this is the 9th item in line.

I think that we should let the FPC decide this, or at least ask for their opinion.

How does the spec file in question look like with the macros?

https://github.com/abrt/abrt/blob/master/abrt.spec.in

AGREED: Defer to FPC, but indicate that FESCo suggests that the "readibility" guidelines can be relaxed. (+7, 0, -0)

To clarify that a bit, FESCo has established the Fedora Packaging Committee (FPC) to make packaging guidelines, and we feel this decision is best left to them. FESCo believes that the readability guidelines can be relaxed, but ultimately leaves that decision to the FPC since they were established for that purpose.

You can file a ticket with the FPC here to ask them for a decision: https://pagure.io/packaging-committee/

For what it's worth, while I very much prefer readable packaging, as a package maintainer for software across multiple RPM based distributions (Fedora, RHEL/CentOS, Mageia, openSUSE, et al), it'd be way nicer if I could leverage the same spec everywhere.

However, I think if we allow it, we should absolutely document how these conditionals work, similar to what openSUSE has in their guidelines (though a bit more up to date... Mandriva is dead, after all...).