Tim Killian writes:

Mill drills don't have the mass,
scraped ways, or ball screws found in the bigger machines.

The ways are certainly scraped on the import mill-drills.

The Acme type lead screws use the same principle as a stock Bridgeport
Series 1, although lighter and less precise. Ball screws are not common on
Bridgeports.

It is a smaller machine and less massive, but the weight is appropriate for
the scale of size.

Your experience of 0.01 tolerance is much worse than mine. The errors of
my machine are a few 0.001 and repeatable.