I imagine this is because you haven’t been bitten by missing critical emails due to gmail’s overzealous spam filtering.

This has happened to me multiple times. Most people would likely never notice the opportunities they missed as a result of such.

I’m talking about real live false positives, on important messages from real live human beings.

Additionally, gmail spam folders even well run, nonspam, properly configured and secured mailservers AFAICT simply for not being part of the wider deliverability cartel.