AS a UEFN user, I think I ve only used the message log very rarely, yet the window will pop up every chance it gets and block whatever I am working on.
Also, by default it will show in another window, which blocks me from simply clicking UEFN icon in taskbar and going in there (a task that is done everytime we test, because after testing fullscreen you need to go back to UEFN), because now there are two windows to select from.
Also pops in your face when importing content to tell you of the same smoothing error that we will never care to fix anyway, blocking you again.
Message log needs to be like output log. Not popping up, or if it does, a toggle to hide it and convert it to a popup on lower right corner instead, where it conveys information then goes away (with a link to see message log in it), then if you want to see that information afterwards, you open the message log window.
I tend to get blocked by that window almost 4-5 times per session and I only use it once per week, so its not useful atm, so let me turn it off.