Even an average ohmmeter like the one below is more accurate than something like a Fluke 289 which costs several hundred dollars calibrated. Which is about as cheap a DMM as you'll find able to read low enough to any degree of accuracy.
Even a Fluke can't beat the accuracy of one of these purpose built units and it gets absolutely demolished in terms of performance per dollar. The only thing better would be a bench 4-wire tester, not a cheap option.
The problem with DMMs is that they're just not built or intended to be used for reading low very ohms. There's no demand for it from professionals because for that matter either because they have vastly superior 4-wire testers to go to when they want accuracy.