First off, the three pages that we have scans of...
The first page here does make a point of noting that rules are meant to be broken, and it is up to the creator's discretion how/when/where to break them. Although it should also be pointed out that an eight-panel grid has been pre-printed on all the art pages. Colón can be seen to write/draw through the panel borders repeatedly, though he still maintains and follows that underlying grid. One can scarely imagine breaking the page up into three columns, much less a wild Neal Adams layout.
It's worth noting that the both the panel structure and the written rules on the first two pages emphasize a regular story beat. Every story is going to open the exact same way, both visually and dramatically. Plus, there's a good chance the story is going to unfold with the same pattern.
I can see why a company might do this. It does provide a sort of continuity for readers. Different from the continuity that Marvel and DC had long established by then, but the regular rythm of the story -- of every story -- lets readers in on how the world of Richie Rich works. Certainly Harvey's other comics like Casper and Little Lotta had similar such guides. And, in thinking back on the stories I read back in the 1970s, I suspect they did something comprable over at Archie as well.
Some people have called Marvel's and DC's adherence to continuity a crutch, and that it was preventing new readers from coming to and enjoying their books. That's certainly where the New 52 came from. I wonder if that stricter adherence to continuity is what hurt Harvey? If their creators were so saddled with the continuity of format that they couldn't creatively break out and do anything besides what had already been done before. They kept telling the same story over and over again in five page installments, and burned themselves out. I mean, look at where Harvey is now. (They ceased publishing comics in 1982.)
I can't help but wonder if Marvel and DC are heading down that same path; it's just taking longer because their stories last longer than five pages, and it therefore takes longer to notice the repeating patterns.