The lack of capitals damages readability for others. It's also a writing style strongly associated with arrogance and pretentiousness; but a specific variety of it. Not surprised you've been complimented on some corners of HN.
Every person I've seen on HN who drops capitals is invariably an arrogant prick about it and other things. It's a strong enough calling card that to write that way and be otherwise would be like having a moustache and explaining everywhere "no, I just really like Charlie Chaplain".