Are breadcrumbs necessary?

Question

Search Engine Optimization

Perhaps my question was asked incorrectly and should be rephrased:
Do breadcrumbs affect the promotion of a site in search engines?
If yes, how much?
What can breadcrumbs solve for a site in general, excluding user convenience?
Do they have any weight for the good of the site?

Answer 1

you should design the interface for the convenience of the user, not for bots. For bots, it's better to generate a sitemap.

Answer 2

can
Google snippet, if possible, composes with them,
but not always and 100% xs how to force it