I carry some crazy stuff on the rack that goes into my hitch receiver. Rated up to 200kg. Most recent large object was a small gun safe from Costco, maybe 250#.
I also have lots of cinch straps and know how to use them. There was plenty of extra strap capacity.
But your point is well taken. A lot of folks are clueless on securing loads.
Ratcheting tie down straps have saved many lives that would have otherwise been lost, caused by the inability of many people to tie a decent, secure knot.