not poor engineering, just minimal amount of room in ANY unit for a full door swing with the opposite slide closed... there's no unit from any manufacturer that will have a full door swing on the mid 1/2 bath, other than a few that may put their door on the 'corner' of the bath,,,, but then the drawback is more loss of room BECAUSE of the door swing.
it's always a compromise, but one you can easily do yourself is to leave the door fully open, then close the slide.
'14 Thor Palazzo 33.3 compact diesel 100k+miles since '14... US, Alaska, Canada...
AND a '14 Gulfstream Amerlite
AND a '07 ForestRIver Rockwood