Like most sweeping generalities this one's probably mostly true. But I'd give you SIP roots as an exception. If you were to try to match root base with harvest on disconnected plants you'd probably get it wrong.Big roots = Big fruits.
This is immutable.
We get mostly the very fine feeder roots which I've always attributed to the constant availability of water removing the need for the plant to build a major root system, but then I see DWC which should be an even more extreme example but those roots can grow huge.
We can get a pretty dense network of those roots, but the overall mass is actually quite unimpressive when compared to most other styles.