A Whole Thing of Candy Beans

"let me show you what i just bought from" it’s an ad

this is a leg off of Argentinosaurusof them and its already the size of a two story house like LOOK at the size of these fuckers

Like, they're incredibly unspecialised herbivores who just ate everything and let the gut handle it (hence why they had to get so big, just because they had to fit A LOT of gut in there) like their mouths were basically just Rakes.

This thing was built to sweep its head from high to low to near to far and rake in everything it could eat. By evolving a long neck it basically meant it was giving itself a huge range of motion to eat with but also being VERY energy-efficient because moving your legs takes a LOT more energy than just. Tilting your neck up and down, especially at that size. So this thing was basically built to be incredibly, INCREDIBLY energy efficient, light and weight-spreading for its size.

Blue whales sort of practice a similar feeding style, where because they're so Big and need so Much food, they just sort of went "ok im just going to take in AS MUCH food as possible as efficiently as possible" and the thing is. Using baleen takes 0 effort really other than opening and closing your mouth. Which is why whales can grow to be really big. See in the ocean weight matters less, so you can afford to just have a big mouth, but land animals have to do it differently.

Being Big isn't just a case of having lots of food available. It's about being as Efficiently able to eat it as possible. Hell, i mean elephants basically evolved the same thing, except they've just given themselves really long noses rather than necks. It means the elephant can stay in one spot while still reaching huge amounts.