I left my small company to go work for a large company since my career has only been in startups and I wanted to see how they do things at a 10k+ employee org. If I end up hating working for large companies I’d consider going back to my smaller company. Not all companies are shitty and not all departures are a burned bridge.
I didn’t say we always needed to burn bridges. In fact, I don’t think you should ever burn a bridge. That’s a rare scenario where you might want to return… but I’m also curious why you wanted to see how they do things at 10k+ orgs when you were happy at your current employment - that seems like quite the leap of faith to take when everything in your life was perfect.