More responsive breakpoints (Desktop, Laptop, Tablet (portrait), Tablet (landscape), Mobile (portrait), Mobile (landscape) and with ability to change the values ourselves for each

We just have three breakpoints currently: Desktop, Tablet and Mobile. This is not enough for majority of things. For example portrait tablet looks more like mobile but wider and landscape tablet is more close to a laptop screen, but it's not as wide. Having one design for tablet will either go towards mobile or laptop display and whichever you use, it will look awkward when flipped to other side.

Let's say you have Posts Grid block displaying 3 posts in 3 columns on desktop. For tablet you can display two columns and for mobile everything is collapsed to a single column. But, if you chose two columns for tablet, that is okay for portrait mode, for landscape it will look like one columns is missing as tablet landscape could fit 3 columns easily. Stretching it also doesn't work well as grid looks awkward then. In any case, it's a design difficulty when you have just three breakpoints and we have to solve things individually by CSS now which is a very manual process and painful.

I hope you will consider adding this feature!