Its a mess
I hate how it tries to think for me how should I organize and visualize my email. Everything gets lost. Also if someone replies an email with an excerpt of a message I previously sent, this crap hides it, and i cannot quickly get the full message, then acting stupid replying with a question about the hidden information. Grouping different messages sent to and from different recipients on a single thread based on message content makes everything a mess when you have a business where you need to provide specific information back and forth between different people, with control of what information should be forwarded to whom. Because of this terrible app, they are letting the old gmail app die, without updating it with with resources like proper use of alias.
nbarros8 about Inbox by Gmail, v1.3.23