"Block Name" in Custom Template dialogue

Just wondering what this is for? I'm searching and not finding...

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mkly replied on at Permalink Reply
This was added in 5.5 to accommodate addons that had traditionally depended upon Global Scrapbooks to function.

You can see this github pull request

There was a forum thread about it somewhere.

Basically it's so that blocks can be accessed in addons by name using
$block = Block::getByName('My Block Name');
melat0nin replied on at Permalink Reply
Does this therefore allow for selective display of blocks within a given Stack?

So, for example, a stack could be created which contains several navigation-related blocks, but to display them separately in the theme Block::getByName() could be used?

It always feels a little wasteful to me to create an entirely new stack when I know I'll only be putting one block into it (probably silly, I know, but it doesn't feel very efficient!)