Forget about Sendmail. Or Exim. Or Postfix as default install.
Really.
There's two types of people using fedora: 1) People who don't run a mail server 2) People who very deliberately do
For 1), all three are wrong. Really. All you really need is some minimalist commandline compatible thing that just forwards to some smart host (or maybe does only local delivery). SSMTP or similar is perfectly fine for this, while not taxing memory or boot time.
For 2) these folks have a VERY specific personal preference. This entire discussion proves that. These folks already have to configure their system from the default... making "pick a mail server of your taste" part of that is the least of their worries.
Anybody trying to argue for the politics of Exim/Postfix/Sendmail as default choice is ignoring the reality...