That has generally always been true and is a function of there just being only so much space.
Actually open up the hood of your car. Take a look inside. Most of that is engine, battery, and reservoirs. In a sedan or a small SUV there just isn’t a lot of room to make everything accessible from the top. Whereas jacking it up, popping off a wheel, and reaching in for the thing you might touch once in the lifetime of a car is pretty trivial.
Back in the day? I remember my dad having the kids sit in the engine of his pickup truck and my mom’s giant ass SUV to follow instructions and work on it. But you would need a REALLY small child to do that in a sedan.