I'm not sure the argument in the first paragraph has much practical resonance these days.
Let's agree that people are much less likely to have Denby/similar sets as they're 'starting out' now, and that younger people who've left home are more likely to be in private rentals thus moving more than they used to. If they get married, they probably live together first and so crockery is a less popular wedding present now.
So you go through your earlier adult years not getting any Denby, because you can't afford it and there's never a time when people have reason to give it to you. You use your Ikea/supermarket/chazza stuff because that is what's accessible. This is a norm.
Eventually, if things go well, you'll reach a point where you can afford the likes of Denby and you're also sufficiently securely housed that you don't need to worry about having to transport all your stuff every couple of years. But you probably already have as much crockery as you need. For people like me who truly don't give a fuck about what matches, you perhaps could do it a plate at a time... but most people seem to like matching. I notice most of the Denby havers in here are talking about sets rather than doing it piecemeal, which says something.