What problem does this address?

In my custom block, I'm trying to control the block layout by utilizing the core blocks, without introducing unnecessary complexity/nesting.

For now, I am using a Group block wrapper, which I am changing based on the block settings selected.

I wish I could utilize:

{
	"supports": {
		"layout": {
			"default": {
				"type": "flex",
				"flexWrap": "nowrap"
			}
		}
	}
}

and then just update the layout via edit.tsx in the same manner I'm doing with the Group block attributes:

const block = select( 'core/block-editor' ).getBlock( clientId );
	block?.innerBlocks.forEach( ( innerBlock ) => {
		if ( innerBlock.name === 'core/group' ) {
			const updatedBlock = {
				...innerBlock,
				attributes: {
					...innerBlock.attributes,
					layout: setGroupAttributes( attributes.thumbnailsPosition ),
				},
			};
			dispatch( 'core/block-editor' ).updateBlock(
				innerBlock.clientId,
				updatedBlock
			);
		}
	} );

This would enable the same functionality, without the unnecessary Group block wrapper.

What is your proposed solution?

Expose the "supports": { "layout": {} } via block attributes proving a way to update them.