exasperation

You're comparing animals with fat throughout the muscle to birds that don't.

No, I'm comparing the same species of animal. We've gone from 100+ day old birds weighing 2.5 lbs to 47 day old birds weighing 6.5 lbs in the last century. That seems comparable to the difference between old roosters for coq au vin or old dairy cattle for vaca vieja and their respective supermarket counterparts.

Also, the connective tissue only starts to break down once getting to about 192f and needs to hang out for a good while between there and 210 to slowly break down.

No, collagen starts to break down slowly as low as 130°F, but the breakdown speeds up as the temperature rises. There are ways to play around with this with different techniques, where doneness is more than just getting the meat to temperature. It's why poaching chicken used to be more common than it is today. It's why chicken wings taste best when double fried. It's why confit works so well for duck legs.

Also, steak was best 200 years ago as it is now.

Ok, again, if you've ever had to work through cooking something like vaca vieja, you'll notice that it doesn't cook the same way as a steak that's been dry aged, or a regular steak at Costco, or a lean grass-fed steak. If your steak technique is the exact same for all of them, you're probably missing out.

And I'm guessing the NY Times wasn't exactly building this conclusion based on only steak recipes. 150 years is gonna have a lot of non-steak recipes in the mix.

Methods changed because we got better at cooking.

That's part of it. But also, trends come and go. I'd rather have a 1950s cheeseburger than a 1990s cheeseburger, and much of the post 2010 scene has been re-implementing some old techniques that fell out of favor (smashing patties, simpler bread for buns, fewer toppings) and a backlash at some of those things that got out of control. Cocktails went through something similar too, with old classics coming back (either as is or with a new variation).

I'm sure any comprehensive catalog of recipes over decades is going to include some fads that fizzled out, like low fat stuff in the 90's, etc. It's not some kind of inexorable march of progress.

I'm betting chicken always could have cooked faster.

Chicken can be cooked to temperature quickly, but that alone likely wasn't enough. We know this for plenty of cuts of pork and beef that the connective tissue needs time to break down, not just a pure cook to temperature (see braising, smoking, and sous vide techniques).

Something like coq au vin, which was developed for cooking older, tougher roosters, traditionally calls for a low and slow cook to break down the tougher animal.

You can also see the difference when buying cuts like vaca vieja (old dairy cattle slaughtered for meat), which calls for different preparation based on the tougher meat.

So no, I can believe the meat itself is very different today, and the recipes adjusted to the change in ingredient characteristics. We've documented that the manner of raising animals is totally different, so why would you be skeptical that the meat is different?

No sorry this is gastro-entomology.

How do they know the paint didn't do it?

There were 3 groups of black cows: an unpainted control group, a black stripe group painted with black stripes (not very visible because the cows were already black), and a black and white painted group. The control group had similar results to the black stripe group, which suggests that the black paint alone didn't do anything.

So further research could be to compare to an all black painted group and an all white painted group, with no unpainted fur, as well. If it's the pattern, then one would expect the totally painted cattle of either paint color would see similar results as unpainted.

Not in this case. I don't know whether this particular VFX studio treats its workers fairly, but I've heard that the whole VFX world is generally terrible to its workers.

That all is beside the point here, though. The VFX studio doesn't employ writers or actors, whose strikes shut down production of films. So it doesn't matter if the VFX studio treated its staff like kings. They were still going to lose a ton of work during the strikes, so there's no avoiding these issues.