I was thinking exactly along these lines. There must be millions of possible topics. If anyone were truly expert in ten unrelated subjects I would be in awe. Having sufficient knowledge about a hundred to be able to comment knowledgeably but not expertly about them is a lifelong learning feat that is also awesome. Sounding good in a casual conversation is the most we can aspire to, and nobody is checking and challenging every word while standing there.
The internet feels like a casual conversation, but it’s a different beast.