This is just my 2c as an outside observer, software engineer ofc. I'm sure some MBA could make a case for said synergy. But it made sense to acquire Instagram and WhatsApp, for instance, because they'd face similar tech challenges and could benefit from each others' growth playbooks. But Oculus?!?!?! IMO Facebook had a better chance opening a cloud computing division.
So, achieving the Metaverse dream with the money Zuck has spent was always gonna be a tall order at this point but if anyone could've made it work, it wasn't gonna be a social media company.