That's interesting. Facebook is currently testing a new, automated process to help you optimize the performance of the Reels posted by a business page, experimenting with different variations of your content without you doing anything.
In the publishing stream of Reels, a few Facebook Page administrators will be prompted to try "Auto A/B" testing, which will create variations of your Reel and then serve those to segments of your audience.

As the pop-up reads:

"We'll test different versions of your reel with various captions, covers, and more, and share the top performer for you.".

It's the latest evolution to Meta's automated creation options, with the platform also experimenting with auto-generated templates for Reels promotions, which helps optimize your creative into the best-performing Reels formats.

Meta also added caption A/B testing for Reels creators last November, which is a similar, but more manual variation of the same.
This one, however, takes more control out of your hands.

Because Meta is continuing its steps into AI, more elements will be added to its Advantage product suite for ad partners, including improved ad creation and placement options, based on Meta's systematic understanding of performance.

Indeed, eventually you won't even need to create an ad at all, with Meta's system taking product info from a URL and populating a campaign, in alignment with creative best practices.

That's the aspirational view of its Advantage suite, however; most marketers will likely want to exercise their own sense of audience knowledge and judgment in choosing the most effective, evocative campaigns.

Though if Meta's algorithms produce better results, it might be worth a shot. Not all Page managers have this new option yet, but when they do, you might want to be one of the first to test them out, and cross-match the results against how your creative performs, compared to the one that Meta recommends.

Theoretically, Meta's systems should come up with better options, based on a broader understanding of what works with Facebook and IG users. Again, though, it feels like placing a little too much trust in the robots just yet.

Either way, it's another consideration. Meta is currently testing the option with selected Pages.