I would like to know how to scale everything including text within a section/container proportionally, instead of having to guess the text scaling so that it would stay in position.
Being able to scale everything within the viewport proportionately is very useful. A website for example https://teenage.engineering/
The website would look cleaner without having text moving around.
Those sound like the SAME problems I was dealing with. The cart icon is still an absolute nightmare but I've got more control over it. Not sure your exact situation but placing it inside a container is what really helped me out.
Watch the video link I sent earlier (here) from the 2:00-8:00 minute mark on how to layout the header with icon, menu, and shopping cart. If that doesn't do it you can send a screengrab or screenshot and I can see if I can help. You can also submit a ticket to the Editor X team. Despite the incredible frustration with their limited resources, the EX team has been very kind and helpful to me.