Can't you just have Facebook and only use it for the events/photos? I've got a Facebook but never use it for posting/looking at other people's posts. Every now and then I'll get an invitation to an event which is really all I use it for.
With your help? The moment you declare (or any friend declares) a relationship in the profile, they 'have' you both.
If someone wants to talk to me I get a popup on my Messenger app on my phone, and if I get an event invite it shows up there too.
Problem solved.
So, that's one downside, I think.
Good for them, but they seem to mistake it as some sort of universal lifehack.
Does it have to be universal to be useful? Helping 0.01% of the US Facebook userbase save 1 hour every week is still huge...
There's a few communities that I'm in that I wouldn't even know about, event-wise, if I wasn't on Facebook. I can't imagine missing those- I'm surprised others don't use Facebook more for events.
As others have mentioned, I also use News Feed Eradicator, so I don't even see anything on Facebook, unless it's one of my close friends. It's fantastic, and my time on the site is probably less than 2 minutes/day.