(I'm not staff)
I think that the Enhanced Staging is to help you develop using the CMS versus on the usual free staging and it's included free in all Lite, Pro & Team plans. It's practically like a bulked-up free plan, you pay nothing for it (which is a godsend).
Think about it like this (though it's bad to compare apples and oranges), Webflow versus Squarespace. On Squarespace I'd get 14 days to build and launch my client's site. While on Webflow I get to pay my usual monthly plan and have a site "staged" for as long as I want. This helps especially when I have large corporate clients where things need to go through approval processes.
An alternative if you will, would be paying for your own server and hosting there, but you still pay a monthly (or yearly) fee BUT you are limited to how many you can host. (I think there is a limit to the Lite plan, but for Pro & Team you get unlimited sites).