The benefit is to be able to go in, sit down, relax and be served instead of CS.
Also, less crowded than CS.
It is an option for those that enjoy it, and was also always a lower price option for than other TS in MK.
Since DDP, many on that plan meals around the biggest "bang" for their buck always looking at item costs to book the most expensive one as on DDP, all meals cost the same when 1 TS places.
Last year, we were waiting near the Plaza for Wishes, and a woman mentioned they always loved to eat there but are not allowed to anymore because her husband won't waste a DDP credit on such a cheap meal.
Us, we pay OOP with no DDP and eat where we want.
I enjoy the quite time some days and it is only a little more expensive than CS.
I see no reason to make it CS - there are plenty of CS options at MK for those that prefer CS without taking away the Plaza as a TS.