What are the things you don’t like in Jupiter, so that Jupiter team can change their ways . In my opinion,
Takes more time to fix a bug / to introduce a feature, if I send an email they will call me instead of replying to that email, even for a small query/information.
Mention if you feel any.
I completely agree with your point, and I can relate to your experience. I am currently facing an issue and have been in contact with them for follow-up. Despite providing with detailed explanations few times, they want to know the same info repeatedly. Although, I understand that they are simply trying to help resolve the issue.
I am waiting for dark mode. 
I don’t bother if they call. Because communicating through mail may take longer time for them to resolve the issue. But they don’t improve the app and note everything as feedback.
This statement effectively summarizes everything, and I wholeheartedly agree with it. @kirankiran10333. 
While I understand the development side of the business, I’d say time taken to fix a bug and role out a new fetaure.