That actually makes perfect sense. Hyatt has always wanted to limit cancellations and rebookings because it's bad for overall business -- what may be inconvenient for the individual is a boon to the group as a whole.
An EPlus exchange is not a cancellation and rebooking from the Hyatt perspective. Using Hyatt points in II is a one way street, and once the points have been moved to II it’s no skin off Hyatt‘s nose if that reservation is changed.
They may have never liked cancellations and rebooking in the Hyatt system (I really have no idea) but II seems to like EPlus just fine, and to consider it dandy for overall business.
The obviously fair solution is to use previous points charts for existing reservations made with the EPlus feature- because EPlus was bought to make retrading possible but the points reconfiguration has made that difficult to impossible. It’s not an “inconvenience” but rather something that is questionably legal- to sell someone a retrade feature and then make many or most retrades impossible, and the points associated with the reservation (if it can’t be used) worthless.
I‘m in the same boat as the poster whose concerns you’re so dismissive of. I have three interval reservations with EPlus, two of which I intended to retrade and now will have a hard time doing so. The sale of my Highlands Inn week fell out of escrow on account of Hyatts changes to the II points charts, and because there’s points left that were to go with the sale, I’m forced to keep the damn week a little longer in order to make my EPlus retrades. Then I have to figure out how to unload my week ideally in a manner such that Hyatt doesn’t get it back- because I really don’t want them screwing over their owners and benefitting from it.
Thank the lord that I sold my High Sierra week right before this happened!