We need to take a serious look at the blocks in v11, as right now there are several new ones that seem to differ only by output templating. That should be a parameter difference in just one block.

Some changes:

I'm moving away from the 'feed' idea. Instead main_multi_content will have many different rendering modes, for different ways of rendering out the data model - i.e. it's based on data, not activity. So, there'll be no 'grouping'; instead galleries with recent new entries would be sorted higher for a new 'prominence' sorting mode.

"The Setup Wizard would put the block selection behind an advanced expander too."

I think this can stay, but instead the main_multi_content block will be on there and not much else by default. There are still other blocks main_multi_content won't deliver the functionality for.

This is now mostly implemented - the main_multi_content block can render tiles (and grids, and other modes). The frontend code needs a lot of work still though, and there's a lot of work to do to see if we can streamline how many blocks we have (see #3929).