I haven’t read much Talmud yet, but the extent to which the rabbinic sages got into the weeds on topics like this kinda makes me wonder if some of them were just high-functioning autists whose wisdom was just the product of a spectrum disorder that there was no diagnosis for at the time. It would certainly explain how you get from “thou shalt not boil a kid in its mother’s milk”, which probably originated as a warning against imitating some other tribe’s sacrificial practices, to “don’t boil any animal in it’s mother’s milk, and don’t eat meat and dairy together at all because you don’t know if that dairy came from it’s mother’s milk, and don’t even let them touch on the same plate or combine in your stomach, and don’t eat poultry with dairy either, because dove meat kinda looks like beef and if someone saw you they might think you were eating milk and meat together and therefore it’s OK for them to do it to, and you know what? It’s probably best if you have two completely different kitchens in your house, one for meat and one for milk, so you just steer clear of the whole can of worms altogether. Don’t eat worms either, BTW.” Being a rabbi wasn’t a paying job back then - these guys had full-time jobs on top of spending all their free time arguing over the details of Biblical law and obsolete Temple rites. They were in this for the love of the game.
In any event, the Seder I went to probably wouldn’t have met Orthodox standards, since the matzah ball soup was made with chicken broth and there was almost certainly milk in the chocolate desserts. I do understand that the temple’s kitchen is typically only used for preparing dairy products and they only serve meat made in the kitchen if they do a thorough cleaning first, so I guess the Seder food having been made off-site and just served in the building was enough to satisfy that requirement for any members who are sticklers for halacha. In the Intro to Judaism class, the rabbi said he’s only keeps “kosher-style” in his personal life - he doesn’t eat pork or shellfish, and typically won’t mix meat and dairy in home cooking, but he’s more lenient if he’s dining out.