I'm sorry but I just hate that telephone thing. I'm not new to OLD as some may assume actually... I didn't like the phone when I was doing it 5 yrs ago, I don't like it now, I don't like the phone at work. My conversational skills and comfort lie in the written word (email, texts) and face to face conversation - not the phone. We can't all be the same.
With the guys in question, both assumed I'd be ok with it, that because it was their preference then why of course, it would be mine too, neither asked, neither suggested or enquired - which to me would just be basic courtesy. If I fervently wanted to speak on the phone with one of them I wouldn't just give my number to them then say well I'm leaving this site whatsapp me/phone me - I'd suggest it and see what they said.
And as for never speaking to the person verbally before going on a date. Firstly, I'm sure I would speak to them before the date rather than the assumption that I would never ever speak to them on the phone - just that I don't want to speak to them now, at this stage and if they want to switch to whatsapp then I'd just appreciate being bloody well asked, not told!
However, aside from their speaking voice, you can glean virtually all you need from the written word. Just like people leak emotions in the form of micro expressions and body language when you're in front of them, believe me, it comes through in what they write just the same.
Personally? If I've got to share my mobile number in order to communicate via whatsapp then I'm not interested. If I met them and didn't like them and didn't want to see them again, I wouldn't want my mobile phone number to be in their phone in case it turned out they were a fruit loop.
Personally and since I'm a +80wpm touch typist and my text composing speed is about 80 characters an hour, I find using the 'crappy' dating website a lot easier!