But these gmail features aren't remotely like inbox. They hide the emails behind alternate tabs. Ones you cannot configure yourself. With nearly no indication instead of putting them front and center (but grouped together). They make it harder to see and understand your inbox instead of easier. This post being a perfect example -- tons of people didn't even understand what was going on because of how awful the feature is.
Inbox was killed and its main features lost with it. They were not folded into gmail.