I quote: "why do you keep hitting RotW countries with unnecessary nerf after unnecessary nerf?"
I'm glad you realize that your original criticism was false but you should own that instead of pretending you were making another argument all along.
As for Mesoamerica being a drag, I recently finished a Sunset Invasion game and had a blast. I fail to see why Mesoamerican countries require seizing colonies outside coring range to be fun.
I play the region a lot. Here is the problem with 1.13 Mesoamerica:
If you unite the region and pass 5 reforms before 1520, which is pretty generous (you don't have to be an elite player to do that by any means), you rely one of two things:
1. Burn 1000's of ADM to reach exploration, just so you can sell a province to the AI, which of course has to "want it"
2. Hope the AI hits you with blind colonial conquest soon enough that you can actually defend still.
Once, in 1.13 I tried to skip teching to ADM 5 and just let the AI attack me. The result of that approach is that from 1521 to 1601, I could do nothing at all. No AI colonized in range of my sight, nobody declared. I don't have the DLC so I couldn't use development. Of course, ADM 5 is a big delay unto itself especially if your ruler luck isn't excellent, but being all but forced into a group if you don't want the alternative of "just sit there 80 years" isn't an ideal setup. No other location in the world is so constrained.
80 years is an outlier in this scenario, but waiting 40-60 (especially if you unite the region sooner) is not uncommon, and it's a step back from 1.9, let alone 1.11, in terms of "time spent waiting for either tech or AI". A while back I made a suggestion while you were on vacation, but for now the simplest thing to do that wouldn't be TOO much of a reach is to simply let Mesoamerica see the Caribbean. Without boats, you couldn't do anything there, but it allows diplomatic interaction with the Europeans pre blind-dow (contact which did happen historically) without a major overhaul, with some basis for it. Alternatively, the ability to do diplomacy with nations whose units you can see would be a helpful change as well.
The game is 377 years long, spending 40-80 is too large a chunk, and that chunk wasn't there from 1.7-1.9, or even 1.11 with colony seize.
Hoping that you happen to get lucky and have the AI colonize near you pre-1550 is not everyone's idea of fun.