Sorry to tell you but we are all beta testing becuase, if you haven't heard, Bangledesh, where the company is based, is bankrupt. They have spotty internet and electricity. Some people don't even have proper computer equipment to do their work.
I sincerely hope this is not the case in regards to staff having good equipment but electricity and internet is something that is at the mercy of the local government utility.
I regret the day I upgraded from 3.x to 4.0.x.
I agree with all your deficiencies observations.
Today, I find that I am unable to update to 4.0.4.
It's reporting:
Error installing component
Copy failed
The file is just 2.9MB. Joomla is set to accept file as large as 8MB. So what's going?