Most recently, those changes have included more algorithm updates that include sophisticated enhancements to natural language processing and machine learning models like BERT and MUM. These updates help Google better understand how people are searching for topics and what type of content the user is actually looking for to meet the needs of their query, then how pieces of content across a site can best match those needs.
Breadcrumbs can also help you shift the structure of your site without having to make changes to URLs, which can be incredibly dangerous for SEO.
As Google has implemented more intelligent ways to process and return content to match user queries, it's important to create a logical topical structure on your site to make it easier to process this content.
You may be asking yourself at this point what is the difference between a topic and a keyword, especially considering I just mentioned that keywords are still an important piece to the SEO puzzle.