Sadly, the way that anything popular is shunned here, say goodbye to native Instagram, Skype, Vine and a few others because well... nobody here would use it, the market that owns a Jolla phone also would rather use Diaspora, Tox.im, and something else (lord I forgot the name of that pic sharing web app, M-something).
If Whatsapp was there on day one, we'd complain about it then too. It's closed source, it's not secure, it's not interfaced by terminal... I can continue.