Still the better one has something like 5% creep or so. These sensors are made of plastic materials which have massive amounts of creep compared to a metal loadcell, and creep in plastic is very temperature sensitive (in fact the sensitivity of these sensors is probably surprizingly temperature sensitive too).
For a plastic to have low creep it needs to be below its glass transition temperature, usually becoming rather brittle.
Or put simply plastics cannot make accurate mechanical sensors because they are plastic 