This is a very good look at the various things that make in-app browsers terrible.

Personally, they are a pet peeve of mine (whether we're talking smartphone apps or desktop apps). I think they're a plague.

I was even unpleasantly surprised when I discovered the other day that FreeCAD uses one. I clicked a help link and was left wondering why my browser didn't pop up. So I ran the browser and did a web search to find the help page I was looking for. After I went back to FreeCAD I noticed that it had opened a new tab in the application and brought that page up there.

Right where I didn't want it. It's a small thing in the big picture, but irritating nonetheless. At least I know now to just go straight to a web search instead of using the built-in help system.