I brought up the exact same question, maybe approx 1 year ago (in supporter's lounge).
Basically get a 'flashed' 'SENT' word on screen of my phone, 1/2 second, then another title replaces it.
I brought it up as helpful feedback, but there are so many bugs / flaws in the Android powered phone that I've been quite happy with the overall EEVBLOG experience; (I often request PM recipient include copy, of my initial message, to jog my memory).
Now, I don't know how a large organization does their web site software management, but many, many large businesses use a Google contracted 'enterprise' package to manage these things. Lol, watching as several doctor's offices all seem to change features in lock-step.
I'm (relatively) happy, in spite of lack of a 'sent' section to use.