That's one approach to building a value machine which makes a lot of sense. However we always put these builds together so you have different choice of components and you are free to mix and match (e.g. faster CPU/GPU from one build with less expensive case/PSU from the previous one). We've been doing these for over a decade now and that's always been our approach, I guess we don't explain it anymore in the intro because it's been like that for so long.
Conversely, many builders will argue they only need a platform upgrade because they can keep the case and PSU from their current build, in which case you can see how it pays off to buy quality components that can last more than one generation if your budget allows for that.
Photos are meant to showcase the cases first and foremost, but I can see how we can update that one you refer to. All our picks are supported by our
best of guides which are updated regularly with more choices for cases, CPUs, GPUs, speakers, monitors, etc., but this is where we put some builds together targeting a certain budget.