Yes it's partly an oversight on Whatsapp's side ie. they should not disable the whole account, just the new device. But phone numbers are often known, so it is quite easy to sabotage someone's account this way. Good services like Threema and others won't even require your phone number or e-mail address, so it is basically impossible to cause mischief.
Yet another reason why you want to always be sure to have a secondary or more service as alternatives.
See
Your WhatsApp account can be suspended by anyone who has your phone number#
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deletewhatsapp
If you're a frequent user of WhatsApp, you may want to keep an eye on a disturbing hole discovered in its security this weekend. It's possible for an
