I think the works on display there would benefit from a more appropriate environment.
Logistically, it makes sense to sometimes put up with the artificiality of a zoo, but I think it's the superior option to appreciate animals in their natural context when you have the option :)
Problem is that creating such environment for each individual piece, or set of pieces, is itself sort of an art. I've indeed seen paintings on a white background which was just way too much brightness to my liking, making it hard to focus on the work. I've also seen paintings on a black wall which made the entire thing look dull (possibly because of badly positioned spots as well). I've seen paintings for which background didn't seem to matter. I usually don't really like what churches look like but Caravaggio's stuff fits well in them, imo. I went to a small exhibition in a forest once which because of the style of the paintings made all kinds of sense. Etc.
Arguably the only one who can tell what the proper environment would be, is the original artist.