- Theme based on Magento2 Blank. In current case using Luma is unnecessary dependency.
- Also I can hide product name by CSS but I think you meant to remove from HTML.
- Also I can change title using
i18n/en_US.csvbut I try to avoid this in case when we need to rename common words or phrases in one place. - Also I can rewrite styles on flexbox and use flexbox
order. In that case it will be more difficult. - I think I didn't understand this task. Speaking of accordion (tabs) Magento provides a lot of technical capabilities. It's the same for media-check too.
- I could also do it using jQuery widget Modal but I prefer to use knockout style.
- If it need only when changing shipping address form I can do it as validation rule.