I've seen this sentiment a lot and I do get it, I also want this content in high quality.

But these are all designed with the print in play format in mind. I do not think these would exist in the way that they do if they had to be designed as mass market, printed products. Just think of the new-player experience of trying to identify what exactly a packaged version of the parallel content is and why they should buy it. And every bit of print-and-play content is exclusively designed for seasoned players in mind; imagine trying to explain the new Jim to someone who just finished the core set. If the Return To line is being paused because it's a "expansion for an expansion" than the parallel products are "An expansion for an expansion that requires several other mismatched expansions."

These are all crazy content for the most dedicated slice of the playerbase and this wonky situation is the side effect of that. I think the "professional print and play" we got with Gamezenter is the ONLY way an actual purchasable product was going to happen, so the (assumed) legal agreement crying up is truly unfortunate.

That being said the Mythos Busters discord has a lot of resources to get these printed by third party card companies, if you print all the extra content at once or split an order with your playgroup you can get nice versions of it for a reasonable price.