Whilst I agree with you in part it does not matter how good Whatsapp and others are if some Iphone users only have fellow Iphone users as contacts they simple do not need cross platform advantages etc and of course its harder for them to nominate default app
But for the foreseeable all will need some form of sms/mms even if its just to receive OTP codes from your bank or other similar sms's
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Sorry this is not true
🙁
We all know what happens if you do not disassociate your sim with Apple if you swap phones etc, With Whatsapp once your device is registered you do not even physically have have the sim present
Any laptop can simultaneously run the desktop whatsapp at the same time as your phone
Whatsapp document file limit is 100mb