Nazir H. answered 02/19/20
PhD in Arabic linguistics and dialects, 10+ years Teaching Experience
Hi, really interesting question. As a dialectologist, I'd say that different communities of speakers, i.e. regional varieties, answer those questions differently. The spoken forms of Arabic can oftentimes diverge wildly on stress patterns, which can make mutual comprehension daunting.
As far as MSA, the problems you pose are also, as I understand them, about pronunciation. MSA is highly rule-governed but I'm not sure a language exists that isn't also reliant on convention. That is, native speakers may pronounce these words differently depending on factors such as recipient design, epistemological factors and setting/occasion. There are many registers of MSA and questions of style and diction also vary regionally.
I'd be happy to discuss further if you like. I'd also be interested to read what answers you may have come to in your research. Sorry if my initial responses are more sociolinguistic than formal or theoretical.