sorry for the late response, but reason is you can't do a restore with takeout. I can backup from GSuite, and restore into consumer gmail. Its how I did my migration. Or any other combination. It also backs up in Maildir format, which is more compatible with more tools than in mbox format that takeout gives us. So it's just a more versatile tool. You can always convert mbox to maildir, there are tools like mb2md. but ive had issues where it mangles HTML emails and images.
