What WOULD be crazy is if there weren't any other options and >5" was the only choice out there from any manufacturers. So why people write it's crazy makes no sense since we all have choice, and so for people that would like this phone, fantastic, it works for them.
There are still many other options out there for those who want smaller form factor. Maybe when the day comes when 4.3" and smaller phones are eliminated can people start to say "it's crazy", like these bigger phones are somehow limiting their own personal ability to choose their own phone.