Because if the user is primarily associating with the Bluesky community (ie. someone who left Bluesky for Friendica) that may be the first place they find you. They may also not be tech savvy enough (or just not care) to realize it's an AP account they can bypass the bridge to reach.
It was also to highlight that the moment Bluesky starts federating... they stop being the only ones on that protocol, many many Friendica instances are ready to immediately federate with Bluesky as soon as that happens.
Once the plugin updates, I know I'm one of them. There's a number of people who chose Bluesky over anything else that I'd look up and add to my follow list.
After that, some time later there will be AT only servers cropping up, basically AT's equivalent of Mastodon will appear. It'll eventually likely turn into it's own ecosystem with some people preferring one over the other for this or that feature (like some people may prefer the fact that AT has a proper verified user system as opposed to AP... which just has a weak hacked version)
@HistoPol @jamie @oliphant @luca @PCOWandre @m @chronohart @snarfed