Benjamin Mayo on FaceTime 15 in the landscape of collaboration tools like Zoom and Teams:

FaceTime is more like an add-on of Messages, competing against WhatsApp and traditional phone calls if anything. You also see this in how each service handles identity; Zoom and Teams have abstracted user accounts, whereas on FaceTime you connect by sharing your personal phone number or email address — information that you only want to give out to close friends. Source: FaceTime in iOS 15 — Benjamin Mayo

Surprisingly, to use FaceTime, you need to give very personal information like your phone number of your email address… while other competing platform has abstracted that account information a long time ago. FaceTime links represent a step in the right direction, as sharing a link is enough for others to get onboard. Time will tell if this proves to be enough in the enterprise.