This simply is not true. While I use an iPad Pro a lot, and I would consider it my primary computer, it cannot edit photos and videos “just as well” as the MacBook, because there are several photo editing softwares that are on the Mac and not on the iPad, or don’t have feature parity. I use Affinity Photo, and that does have at least close enough feature parity to where it doesn’t impact my graphic design workflow where I’m not really batch editing photos, but a relative of mine does some armature photography, and most of the photo editing softwares he uses or wants to use aren’t available on the iPad, or if they are, they lack some of the features he uses. An 8GB MacBook Pro would run those softwares, while also providing a beautiful display. And on the video editing front, Adobe Premiere isn’t an option either. If you use Final Cut Pro you’ll be ok, or Davinci Resolve, but lots of people use Adobe Premiere. Neither of those things can necessarily be done “just as well” on an iPad Air, unless you use certain apps, in which case, then for the most part that’s correct. Besides, I’d say the concept of “just as well as” is a tad bit subjective depending on the person. Many prefer office software on the Mac over office software on the iPad, especially if you’re using Microsoft’s software. The iPad versions of Microsoft’s software are missing several features. iWork software basically has feature parity, and that’s why I was able to move to my iPad as my primary computer (in addition to my Mac), but it isn’t something everyone necessarily even could do with their workflow if they wanted to, at least not without changing the softwares they use and things like that.
And your also reading far too much into this alleged Apple description, they’re not saying that those use-cases are the only things it’s useful for, they’re using those things as a couple of common examples. That’s not the same as saying “these are the uses you’re limited to”. And I haven’t seen this Apple RAM breakdown before, I’d be interested in seeing the original source where it was taken from and it’s context.