Agreed. We've proven that big tech companies can continue to be productive for up to two years going remote.
I suspect that that doesn't generalize very well to being completely remote over the long term. It works well when you already have a bunch of personal relationships between teammates that were established while the company was in-person. And it works well for experienced people that have ramped up. But I think it's probably quite a bit harder for people to be productive when they are new to the company, less experienced, and don't have that existing foundation to build on.
I think it's a solvable problem for companies that want to prioritize remote work, but I definitely don't think "managed to get through the past two years" means "it's a piece of cake".