Export as vs. Save as

What an excellent answer, I wonder whether it's from the world-class expert, Conrad Chavez, author of: https://www.amazon.co.uk/Adobe-Photoshop-Classroom-Book-release-ebook/dp/B08298XHKD/ref=sr_1_fkmr0_1?keywords=Photoshop+Conrad+charvis&qid=1585292185&sr=8-1-fkmr0

Save As is desktop-oriented, so the files tend to have larger sizes because they can include things like layers, full size embedded previews, full metadata, etc. Great for desktop work like high resolution print projects, but usually impractical for online uploading.

Export usually creates a minimal version of the document, losing most of the editability but creating much smaller files, which is better for online uploading.

For example, if you create a JPEG with Save As, you can include a clipping path, full metadata including resolution (ppi), etc. If you create a JPEG with a command on the Export submenu, you get less metadata and fewer options, but as a result, the file size can be smaller.

Use export as only for web image. Save as for everything else.