Thanks for going to such great length in explaining all this to a non-techie. :)
I have some questions, though:
"When this bridge goes live, you might be followed by #Friendica instances over the bridge."
My understanding was, that all present platforms of the #Fediverse you the AcitivityPub protocoll and can thus federate and I know I do have followers from, say, Friendica instances. So, why the bridge for them?