Because you asked for reasons:
The context of this conversation is how a product should have been done. The devs that make that product want people to use it.
You're suggesting that they ignore part of that user base, based on a claim that people shouldn't browse the internet however is most convenient for them. E.g. by using a computer they already have instead of a tablet they might not. All parts of that reasoning are ridiculous.
Edit: if you disagree, what the heck are you doing on a site called "Hacker News?" Comment, don't just vote.