This specific change (the craft progression through magazines) was necessary because crafting was underwhelming in A20.
One of the main issues was that people were "forced" to spec into something they didn't really want/need, just because they could use that workstation, or that vehicle, or some other stuff that wasn't in their main specialization tree. So, after a while, everyone was, more or less, following the same game meta and always choosing the same "must have" perks/trees (see advanced engineering or master chef as examples).
The other issue was that in A20 you didn't find enough parts to craft what you knew how to craft.
Everyone found in loot what they needed way before they could actually be able to craft that same weapon/armor/tool.
In A21, when you spec into something, you also have a slight better chance to find crafting parts that are needed to craft whatever you're specialized into.
On top of that, in A20, there was also a mechanic where you outright skipped crafting tiers, because when you were able to craft a Q5 Stone Axe, you'd also be able to immediately craft a Q5 Steel Axe, as soon as you unlocked the corresponding perk.
Now, progress is more evenly distributed, and even if you're great at crafting Stone Axes, you still need to learn how to craft good Iron Axes and get there in time.