I don't know if that's the case now, but not many years back Safari on iPhone wouldn't let you subscribe and receive push notifications. Even something as simple as that is enough to render a web based messenger useless. There's also no API to synchronize your contacts, which is something a 'normal' user would expect, nevermind rather awkard mobile browser tab management which confuses even me, someone who is intimately familiar with how web browsers work.
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