I just got an MQ3 and I am also interested in building things that are not really games but basically games with theme parks as an inspiration.
All this is why I'm not holding out much hope for non-entertainment AR applications. Even if your headset is great and as simple to use as unplugging it and putting it on, you won't daily-drive it unless it's better than everything else. For programming, I don't think any VR headsets are going to offer better experiences than Intellij or VS Code.
What I mean to ask is whether tools like this are sufficiently legible on a 2D screen as displayed by MQ3, with a VR desktop? Or to see it well do the fonts have to be so large that there isn't enough room to work?
It's better than you'd expect, given the age and price. My bigger concern is that I just don't want to work in VR. Once the novelty wore off, I just wanted to use a normal computer again. I had much better experience with entertainment like 3D movies and Half Life Alyx/Beat Saber.