When my project was suddenly unable to install successfully, MQDH had no hints for me as to what the problem could be. I've been working on this project for some time, so it came as quite a surprise that it would suddenly not install, and all I got from MQDH was "Installation Failed!" and then it got stuck in this mode where the install progress bar was going forever.
I solved the problem using SideQuest instead.
SideQuest failed too, but it provided me with a useful error message that there wasn't enough space available for the updated apk to install. That was a frustrating waste of time. Basic error reporting like this is something I would expect from a first-party developer tool.