We always glue and frame our puzzles when we are finished (using standard off-the-shelf framing kits from Amazon - nothing like the scale of this article) and display them proudly in a common area of the house for a while after we finish.
But I can see why it's not for everybody, which is totally fine. More open-ended projects are also great.
I know that they had to save the company with licensing etc, but it seems way more about building a particular thing, then never breaking it apart now.
Of course the really cost-effective way to get it remains buying it second-hand by the kilogram.
Adults getting in on the game and dropping hundreds on nostalgia-provoking kits is a relatively newer thing, but it's not preventing access to freeform building supplies.
For me I think the change came when I was able to build more real things. I learned how to solder, and then I learned woodworking, and all of a sudden I could make something that's the exact shape I wanted. Once you have those abilities it's a lot harder to go back.