When configuring a Shopping Experience template, you should get more detailed error messages when misconfiguring a given block.

For example: Creating a new product detail page with the "Three columns, product boxes" block is not possible without configuring it. When trying to save it only says
"Page could not be saved, because of the following errors:
Some blocks were not configured sufficiently."

It would be nice to have a better feedback on which blocks are actually misconfigured. Either via a red border or by actually pointing to it somehow.