ELI5

The other examples about weight for construction are about avoiding long term settling of construction, not a single creatures weight. The overall point about weight per square inch are relevant, but let's take a simple example.

Cattle have a lot of weight on four feet that are smaller than a human foot. When they walk, one or two feet will be off the ground, and they don't sink unless it is muddy. Even then, it isna manner of inches and needs to be really wet. A horse running is putting multiple times their weight down and sideways on the ground and their feet aren't sinking in unless it is muddy.

An elephant has a ton of weight but a larger foot. Again, this relatively small footprint per weight does not let them sink into the ground unless muddy.

So if you are wondering how heavy a human sized character would need to be to sink into dry soil in a noticeable time frame while standing still then the weight would need to be many, many tons.