Why do they use so much grease?

It's the standard practice for assembling gears and bearings

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If you've ever heard bearings gone bad you'd never forget that sound .... "Packing" bearings is a must. Looks to be a proper job there 👍👍👍

that is called 'packing a bearing' and he's doing a good job at it.

That's how you're supposed to pack it in there. All the way till it comes out the other side for proper covrage and dispersion.

Can never have too much grease when packing a bearing

because you have to. this is what corrosion does when you use no grease at all.

Grease is cheap. Metal bearings… expensive if they go bad. They will go bad, without grease.

That dude prepared this vehicle for 1000 nights without worrying about getting wet.

We use similar bearings on aircraft landing gear axles. The standard practice is to use a ton of grease.