Hey@HGWeb - Complicated doesn’t even begin to describe this. 
The fact that so many of us are all scratching our heads and the Webflow Socials team are firefighting says it all. They’ve made an already confusing pricing model considerably more complex and lost an awful lot of customer goodwill in the process. Who on earth signed this off?
I think you have misunderstood. This is how I read this…
As someone with an Agency Plan, ALL your sites have the option to invite 3 seats to the new Editor. (This includes non-CMS plans, and even free .webflow.io staging domains). So for that, these changes are good.
However, if the client wants full ownership of their new website, they’ll be expecting the project to be transferred to them. They won’t have an Agency Workspace, so when transferred, the only ‘seat’ they have is the Webflow account holder.
If the Webflow account owner wants his marketing team to have Edit roles, it will cost him $19 per person month on top of any hosting plan.
Utter greed. Especially if they are already paying for CMS hosting (which previously had 3 seats).
For you to have access to the website after the transfer, the client will have two Workspace Seats available to invite you (as an Agency) to their Workspace. This is free and is entirely separate from any Editor seats. (The same as it currently is).
I will now be advising my clients to have me host their sites in my Workspace. Otherwise Webflow gets way too expensive for small businesses.