Just some general observations regarding some of the comments:
It was never the intention to propose superscopes as a solution to all subnetting needs - far from it. As is made clear in the article, it's a proposed solution for a small company on a tight budget - i.e., no new routers, DHCP servers, etc. It's presented as a quick, easy and cost-effective solution. Complicated (as someone suggested)? No - extremely simple.
Also, as stated in the article, what if there's no need for another physical LAN?
Of course you should keep broadcasting in mind - but we're not talking about thousands (or even a thousand) addresses here - it's about a child scope for a Class C address range. I'd say, as a general rule, if you're nearing the halfway mark of the second scope, it's time to start seriously planning another physical subnet.
VLAN's? Again - this is a small company on a budget, remember? You'll need managed switches - expensive items.
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