Well, I have a lot of experience with producing responsive pages, but not with Blocs - and that may be the culprit. I’ve seen his video and when I try the same thing, the blocs keep popping up above/under each other, but I’ll sort that out.
Here’s another, simple example of responsive behaviour
The coloured boxes on this page (scroll down a little) are also doing what I’m looking for on Blocs, and this is done without a grid, without making three or more different versions for different devices - etc. It’s just fixed text blocs that all have the same height/width - which are placed inside a responsive “row”/container. Since they have the same height/width, and they all are inside the same responsive area, the workflow is quite simple. But I’ll keep exploring Blocs and check out the various ways to achieve this kind of behaviour. A grid based solution (as opposed to one which is made on that page above) has some important benefits too, of course.
“They won’t flow together into three rows on the smaller view. (Maybe in my attempt to show you options I complicated it for you)”. I see - and have to figure our the difference between doing it with cards and doing it without cards. In general, Blocs have become more user friendly that when I tried Blocs 2, and maybe it will continue in the direction I like (a more or less self-explanatory with idiot-proof use of words and help options everywhere). Who knows, maybe Blocs will get regular master pages and spell checking by the time I jump in.
But even if I still miss stuff and find the UI confusing compared with other apps I have used, this has been helpful!