I usually save image in Progressiveimages as progressive.
I have never experienced/heard or heard of drawbacks or rendering problems. And even if some very old browser might not render the progressive effect, they still finally render the image, so it is not a big issue.
Progressive jpegJPEG images are usually smaller in size than the same image without progressive.
I.e.For example, an 8K (max quality) jpgJPG image could easily become a 6K (still max quality) when Progressiveprogressive is adopted and without loosinglosing a pixel of definition.
Moreover, with image editors like Photoshop, saving an image as jpg ProgressiveJPG progressive takes nothing (it's just a checkbox in the window that appears when using the "Save As" command), so I usually do it.