Huh? I’m using the native calendar app all the time since I got my first macbook 7 years ago. I was using google calendar before and it was seamlessly migrated. I am using multiple google accounts and also the icloud account for calendars, never had a problem. It syncs back to google and between different devices, it works with inviting other people and so on.
The only feature that google calendar UI does better is help to find a scheduled time. But I always agree for a time before creating a calendar event, so that’s not something I’d miss. Also, it generates the google meet link, which is again useless since I use zoom or whereby. But even if I wanted that, I’d either have to use the google calendar UI or an app that replicates this feature.
What I nice about the native macos calendar app is that it does natural language parsing, for example, “Meet with X on Monday at 12” will create “Meet with X” event and set the date to the closest Monday, the time to 12:00 and duration to a default 1h. It’s basically like you’re making a note, but it becomes a calendar event.