Earlier quoted context omitted.
I don't think the Quest existed before the Facebook purchase. The Quest was announced in 2018 but Facebook made the purchase in 2014. Unless you mean before the Facebook login was forced upon Oculus users.
Well damn. That flew under my radar. Or I put up some mental blocks because our family really wanted one while some from the older generation could still experience it. Now that I think back, I think we knew that, but it was still an "Oculus" account at the time, before the "Facebook account" requirement was announced. That seems to have been announced August of 2020... just weeks after we bought our Quest.
(in response to the edit) I can see that, my first VR headset was the CV1 Rift and my logic at the time was similar. Sure Facebook owned it but everything seemed to be still fairly separated. None of what happened after was particularly surprising.