Really here in Egypt we do not speak Modern standard Arabic . But if some one wants he could but it will be hard at the first . And it depends if person is educated or not .
My parents do not speak and I think they can not .
Egyptian use Modern standard Arabic just to read Quraan and news papaer ).
https://www.talkinarabic.com/learn-modern-standard-arabic-or-a-dialect/
this site is confirming my idea
You said that Egyptian use Modern standard Arabic just to read Quran, and that is totally wrong. you can argue with some Egyptian about the use of the MSA but don't tell Arabic learners that MSA is not used in Egypt, because they may take your information for granted. Almost every book and newspaper is written in MSA, and any literate Egyptian can read and understand them. Many lectures and keynotes are given in MSA. every country has their accent or dialect to use in their daily life, but they have to learn the correct spelling and grammar of their own language. A British person doesn't need to change his/her accent to speak to an American but they still understand each other.
I appreciate your examples but don't take some worker who didn't get the chance to get a proper education as an example.
KP
Here in Egypt we study in MSA and we study Arabic (MSA). But it just subject we study and answer and get result after that we do not use it at all .After exam Arabic in (MSA) we speak Egyptian Arabic and never used MSA in our life just for studying or reading news paper or books. in speaking we do not use but we just understand it
Please check link above . it explains everything