WhatsApp doesn't understand the web 12 years ago
Sorry but after reading your post and your bio, I got a few points.
1st your career is too short to fully understand the web and be able to judge a company like facebook.
2nd you haven't realized that whatsapp might be its own company but its owned by facebook, and after the buyout facebook did a clear up on devs and hired / assigned their own devs to that.
3rd you haven't realized that the power of the web is fading over the power of mobile web!
I understand that that's a blog and you are free to express your thoughts, but I am really repulsed by the fact that this post has so many upvotes. It makes me think that people reading and upvoting on this site have no idea of technology.