Both buildings are themed, guest-facing structures. I consider that pretty equivalent.
Here, lets take the Haunted Mansion and say we slapped a big fat canopy over the entrance to the point it blocked 75% of the mansion facade. Would you like that? It has zero effect on the ride itself, but that doesn't make it visually pleasing.
I could do this all day with other attractions. If you're going to have some covering over the front entrance, it needs to be themed and a permanent installation. The canopy at Test Track was simply just a cover for display GM cars and a big poster while test track was built.
This 90's concept art shows more of what the attraction should have always looked like:
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As for those "irrelevent" things, taking time to address those "irrelevent" aspects is what elevates Disney above Six Flags. For example, you could argue that area music is irrelevent to park operations, but having seriously plusses the experience.
The only reason I would be so nitpicky over something simple like this is 1. I really want these parks to look the best they possibly can, and 2. There has been to much disregard for the "irrelevant" things in some areas lately in my honest opinion.