I know a lot of folks who are technical (and non-technical) and it was a big enough struggle to get them using Signal. I definitely see the advantages of Wire and not being tied to a phone number but I just don't know anyone using it. It's odd because some of those folks are using Keybase chat though... they just bulk at installing yet another messaging app (regardless of features).
I tried to get people to use Wire but it was buggy enough, and still is with most ignored, the majority of converts have abandoned it. I have continual problems. If it would have been reliable it could have been a killer app as it was basically Skype but encrypted and ostensibly available on all platforms. Having a stand alone (no linked phone) browser (angostic) based option is a great feature. But, it really feels they left the free/Personal version in the dust for their Pro/Enterprise option and from reading Github complaints and seeing a former employee discuss it in another forum I'd assume that to be accurate. Signal isn't much better from reading around and also still requires a phone linked and is only Chrome if you want to use it on the desktop (unless I am behind the times). Seems the space for an all in one encrypted communication/sharing tool available and accessible to all people and platforms has sort of died. I will never trust FB so even if people way smarter than me say Whatsapp is safe it still feels so dirty...and again the phone required bit.