I suppose whether it's a "home rule" depends on how you define that term. I would say that something that is "up to the GM to decide" is a home rule. Or rather, the GM's decision is a home rule.
I ask myself "what is the process of creating a magic item?" I answer "it's the process of creating the base non-magical item, and then casting the appropriate spells to imbue the item with the desired magical properties". I'm not really a fan of rules that say "you can bypass any of the requirements of the process; it just makes the process a little more difficult", though I must acknowledge they do exist.
This is what also starts to open the path to cursed items as a result of botched magic item creation. If you have all the components, the DCs are generally pretty easy. If you start lacking components and have to raise the DC, particularly if you lack multiple components, you might end up creating a cursed item.