One big reason why this is helpful, regardless of how one feels about copying Apple design or putting lipstick on a given Linux desktop design, etc.: If you ar

One big reason why this is helpful, regardless of how one feels about copying Apple design or putting lipstick on a given Linux desktop design, etc.: If you aren't a graphic designer / don't know much about graphic design, you can often use this kind of tutorial to get a more preferred look / feel. Something more in the general direction of the graphical style you like. Then you can customize from there if you want. Remove Apple-specific icons, and so on. So it can be a helpful workaround for "IDK how graphic design works but I want something more polished than my distro maintainer offers". But a LOT of really amazing themers / UI people started out with tutorials like these. It's a thing going back to the early 2000s at least. Those people learned not just how to copy designs, but they observed the type of changes they were making, and developed a refined feel for the elements & principles of design. (Personally I remember lots of lessons in comparing before/after. For example coming from KDE, and thinking "oh, I see now--KDE puts about 4-5 layers of outlines around UI elements, and that's kind of awkward".)