This is a nice blog post - what's with all the hate? So it's basically a marketing tool, but isn't that what blogs are for? As a customer of Soylent, I appreciate that they are writing blog posts about their thought process. It feels nice to be communicated with. Also, I highly doubt a detailed blog post like this is going to convert many new customers - seems like it's mainly for existing ones.
FYI, the new bottles are a nice improvement. There's no wrapper at the top anymore, which is sometimes annoying to open and creates extra trash, and the shape of the bottle is more space efficient for packaging and storage.