What problem does this address?

As I'm using full site editing more, I find that a very common operation is to select a collection of blocks, and then group them together. Coming from a background of design tools like Figma and Illustrator, I keep trying to press CMD+G to group the blocks after selecting them.

What is your proposed solution?

Add a new shortcut that uses CTRL/CMD+G to group the selected blocks with a group block. maybe even do CTRL/CMD+Shift+G to ungroup, although that's much less common in my experience.