It would be great if we could have more granular control over the column layouts for tablet and mobile breakpoints, rather than just being limited by stacked, 2 column & whatever the desktop layout is set to. For instance, I may want a "custom" layout of 4-6-2 on desktop, 3-6-3 on tablet, 4-4-4 on mobile, etc.
You may want to look into either Flexbox or CSS Grid for more granular control of your columns and rows.
Hope this helps :)
Cheers,
Nelson