i have a 2018 15" MBP for my laptop needs. Amazon is having a sale right now on the Magic keyboard, $249 for the 11" keyboard. but i think i'm gonna hold onto the the Smart keyboard, as i don't need a replacement for my MBP and my 256GB 11" IPP was already expensive begin with.
Bottom line, both the folio and magic keyboards serve a need and use case. Apple would love if users buy both.
While I'd love a MK, it's difficult to justify spending that much. Even with the sale, it's close to half the price of my iPad Air 4. If I can find one cheap on eBay or lightly used local market, I would consider it.