It is really tedious if you quickly want to meet with another person without calendar meeting/appointment.. you need to call them via phone or WhatsApp tell them, if they can quickly go into the room. Before you needed to save their proton link in proton pass to then copy it in the moment you want to talk to them and then finally start a meeting with them. I guess this is not how you easy and privately want to contact a person ;)

it seems that at the moment you can't call directly anyone, you need first to share a meeting link?