When Allo and Duo were announced at Google I/O, one of their pillar features was their requirement for a phone number to activate. And as most of you have noticed, this has been very controversial among users: some like the simplicity of the approach, others loathe its limitations: no multi-device support, no web/desktop clients, and a requirement for workarounds to install on tablets, especially WiFi-only ones.

With Duo's release this week, these limitations were put under the spotlight, and while some users like me were convinced by the no-fuss approach of a phone number as a means of identification, others are still moaning the lack of a tie to a Google account.

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