What is really scary...the Big Mac has not changed at all. You have!
The patties are now and have always been 1/10 a pound each. Back when I worked there in the 70’s the meat was 30% fat. I believe it is that or less (fat) today.
The special sauce recipe has not changed.
The lettuce came in large bags, already shredded, 40 years ago.
The cheese came in boxes marked “includes dairy and non-dairy products” 40 years ago.
The buns haven’t changed at all.
Sometimes the haze of nostalgia gets blown away by reality.
I recall the bun being toasted, the lettuce crisp and being able to taste the beef. This wasn’t like that at all.