The word I have finally come up with is insulted. We are insulted at being told what we need, instead of being given what we want. And this word is coming from our users and or clients' management.
Smartermail does so much stuff well, but the constant bug reports and issues with the new UI are a serious drain on our resources as email admins. Give the next release a new number, for all we care; just don't keep changing it for the sake of change. And long live v15, or whatever you want to call it. Yes, we understand that webmail on tablets/phones doesn't always work well, so we install an email client or use that device's built in email. So what?
ST, if you take this as an "attack," then you have the whole thing wrong. Email and Calendars have to work, and work as flawlessly and quickly as possible, on smartphone/tablet clients, and desktop/laptop client software and web browsers. The rest, for most users, is simply fluff.