Are Google trying to dump GMail?

TL;DR - GMail UI deteriorating at speed of Halley's Comet, as easy to use as a Pineapple, only one conclusion, trying to get users to self-host.

I do not know if anyone else has experienced this change, Google are notorious for testing UI changes on their users without them knowing, but recently the GMail UI for email composition has changed from the traditional full screen affair to the following pop-up window:

What a waste of screen space! The last thing I want to look at whilst I am writing an email is other emails that I have. I have rarely been in the situation where I am writing an email about the contents of my inbox.

Email is becoming increasingly informal and conversational. Replies are often quick responses to quick questions or part of a discussion involving several people. As such when writing a reply I want to see what I am writing (necessary, otherwise I would be writing blindly) and what others have written previously. A conversational stream may be a good way to present this information. From what I can recall, this is exactly what GMail used to do. It presented the stream in reverse order, with my response at the top and the conversation below. This worked wonderfully with the scroll bar. Everything was visible, I just needed to scroll. With a good idea of the length of conversation, I could make a pretty good guess at how far I would need to scroll in order to reference a particular response. GMail have since decided that my response should appear at the bottom and only the most recent email should be presented above this, collapsing all other previous emails into single expandable lines above (oldest at the top). Compressing information is fine but I am hardly likely to be able to determine which of the 10 responses contains the information I seek from the first line of each response. Wait! I hear you say. Why not just use the browsers find feature. Ctrl+F and hash in what it is that I seek. I would, if this new system didn't mean that I had to expand every single response by clicking on it and then scrolling to find the next one. Ridiculous! I could go on and list other negative changes but I feel I have gone on long enough and that a conclusion is imminent.

In conclusion I can only assume that they are trying to force me to self-host. UI changes as ill thought out and terrible as these can surely have only one result; angry, frustrated users. I have resisted leaving GMail for a long time in the hope that it would improve. Though as I dumped Chrome when it became slow and bloated,  I expect to dump GMail as it becomes totally unusable.