I agree with you, even though i’m fairly new Blender user i noticed it lacks that kind of simple features to edit meshes (as i indicated earlier that handling 2D lines are problematic). However my whole point was to encourage using addons. It’s not necessarily a bad thing. In fact, thank you for introducing me to your great addon indirectly: CAD Snap Utilities.
And of course it would be great if Blender officially supports such addon similar to yours, because it’s beneficial to all kinds of users and not architects only.