tl;dw

• Blender now have online material assets for download and accessible through asset browser.
• Initial set have useful basic materials with more coming in the future.
• All procedural and very customizable (need to make local similar to linked data block).
• Default mapped to UV on 1x1 meter scale.
• Categorized under "Essential" library, some are bundled, some require online access permission to be visible and download.