I work in development and permitting, and in one of my old stories we had a gas story that I use as a warning to this day.
Guy decided to save some money when he installed a fireplace in his new backyard patio by just tapping into the gas line in the hot tub.
The thing about gas lines is that flames don't travel backwards in them because of the positive pressure and the lack of oxygen in the gas. One day he was burning a fire when the pool heater kicked in and briefly put a vacuum on the line, allowing the fire to get inside the wall of the chimney on the deck and burning down the house.
And since he hadn't permitted the gas line, insurance didn't pay for the fire.
I think the difference between most of the older trek and the newer stuff is that while they did obvious stuff like this, the most impactful social stuff they did was treat revolutionary change as boring.
TOS had a black woman bridge officer, and they didn't make a big deal about it, because in the future there was nothing remarkable about it.