(Also it says a lot that right now my two biggest sources of daily spam are Google Calendar Notifications and Random Firebase Accounts. Both of those further leave me questioning if Google's approach to spam filtering is sincere.)
Just took a peek at my spam folder: 207 messages going back to March 18th, two false positives (both from mailing lists), but nothing critical. I think maybe I’ve seen one spam message across all my accounts in my inbox. Their filters benefit from a huge set of trainers on their data.
(As an aside, I would note that some newer addresses that I publish naked on some websites that I maintain get very little spam (14 messages between the two accounts in the same timeframe, most of which are from a single sender who decided that they should send me their press releases without any means of opting out.)
And I never liked Gmail the client. It's not as godawful as Outlook, nothing even comes close, but it always gets in my way and does things in weird Googly ways. I'll stick with Kmail, thanks.