To add, responsivity isn’t just about mobile devices. It’s also about adapting to different devices and when we need to zoom in or zoom out, text doesn’t disappear or truncate and there is no loss of functionality, and it adjusts to the page, no matter if I’m using a giant screen or a small one, or how much zoom I’m using.
Added your post to my list of threads about accessibility.
ETA for those who didn't know what responsivity means exactly
It’s basically this if you want to take a read: Reflow.
let users enlarge text and other related content without having to scroll in two dimensions to read. (..,)
Users who need to enlarge (zoom) text to read it benefit significantly when it reflows. Regardless of the size of the text, it continues to wrap within the visible viewport. A whole line of text is visible, making it easier for the eye to track from the end of one line to the start of the next. Users only need to scroll in the direction of reading to read additional lines of text.
Modern websites and applications commonly employ responsive web design best practices to adjust or relocate sections of content to fit within smaller viewports. Neither adjusting or relocating content is considered a loss of information or functionality, so long as users are still able to access the content. When content can fit within smaller viewports it not only helps those using mobile devices to read content. It also helps people who need to resize or zoom in a web interface on larger devices, as is the intent of this success criterion.