I'm quite sure this is mentioned several times before, but it seems like it has either no priority or has been forgotten.

In the research tab you can usually see unit information under the "i" button, but sometimes it is simply missing. I use a small screen wenn playing this game. Someone once suggested that might be the problem.

Wether or not that is the problem, it's just diffecult to decide if you want to try a certain unit if you can't look up it's stats in the research tab.

Here is an example of what I mean. There is no "i" in the bottom right corner to see the details of the motorized artillery.