Re: That completely turns me off from wanting to continue using *your* app. Good luck, I am outta here for good now.
I was not making fun of K9. A very competent mail app with some features that Aqua Mail doesn't have (but the opposite is true too).
However:
Their design is dated, it's a fact, and they've been getting complaints about it for a long time. So they want to update it.
And:
When they do, the direction they're going (and this direction is to a large extent is set by Google, and also by user expectations), when they "make the design more modern and clean and airy", all those good words --
-- they too will get a lot of complains about "wasted space", "humongous font sizes", "where did the icons along the bottom go" and more, just like we did with our design update.
There isn't really anything funny about that.
Some users want "modern", others want "tried and true", then there is fashion (yep) and last but not least, technical capabilities ("icons along the bottom" removed by Google from Material Design theme).
The K9 people may not know this yet, but they will get those complaints when their design is done, and will have to decide how to deal with them.