I deleted my FB last year and was really concerned, like you were, about offending people. I messaged my then girlfriend "hey I'm deleting fb" just so she'd know. I have friends that while we're not super close we'd talk a few times a week, usually just sending funny jokes. They didn't see me on messenger so they just texted me. They didn't even realize I'd deleted it. One of my closer friends who invites me to her kids birthdays and what not went to send me an invite and made me an evite when she didn't see my account. She was surprised when I told her I just deleted fb.
I realized I really had never gone to anyones actual profile page in maybe a year or two. Hell, the last profile I may have actually taken more than a cursory glance at was my ex when we first started dating. I guess nobody else does either when you can just @them.
With that said I do feel very out of the loop but it's allowed me to focus on my own life and I'm on a social media cleanse (doh, hn) anyway.
Interestingly enough I do keep having feelings about reopening it but I permanently deleted so I can't and I'm glad I did. Prior to that I had temporarily closed it and reopened it a handful of times.