Where is share sheet in 1Password 8 on Mac?

I understand that security is the most important aspect for you.

For me, it is also important that my vault is secure. However, it doesn't mean that all items in it are equally sensitive. I am happy to share stuff from my keychain through channels like Airdrop, text message, or email. Like pizza ordering login with my colleagues or relatives, or my frequent flyer number with a person who is booking a flight for me.

"to commit to a feature that isn't built yet, one way or another"

the feature is built. It's been present in 1Password 5, 6, 7, and perhaps even earlier versions. I am reporting there is a regression in 8 beta. Unless you already have that much better, more secure replacement, please don't break it.