@nadir husain, thank you for sharing this. Aqua Mail needs analytics and we have given the option to users to opt-out. This is very standard and is very plain and straight forward. Nothing is being "slipped-in" as it would be first of all illegal.
Think of the monthly running costs for the developers and the whole other people involved in making Aqua Mail run. I know they aren't servers but it's a running cost too. Automation hasn't evolved that much to replace them yet so that we can have a running cost for a machine but not having a running cost for a person
Features are coming and being introduced all the time. There are a lot of things being done in the background related to the OS and the neverending restrictions with the newer Android versions that we need to keep up with and preserve the functionality of the app.
Remember that Aqua Mail has more than 300 different features and settings. I really can't think of any other email client to have that many.
For a major feature, I've seen a lot of requests for ActiveSync or PGP encryption. What do you guys think, any other alternatives?