There’s a useful article by Steffen von Bünau of Kontakt on Real Time Location Systems (RTLS). Steffen says:
“Accuracy is an expensive vanity metric unless it is necessary to get the job done.”
Most scenarios don’t usually need very accurate positioning and creating unnecessarily accurate systems is expensive. Steffen doesn’t say why they are expensive but one of the article’s comments provides an answer. Ultra wideband based RTLS is expensive compared to Bluetooth LE.
Also, accurate systems tend to need calibration that’s time consuming and costly in human resource. Calibration implies tuning to a particular physical and wireless environment. If the environment changes then so might the calibration.
The required accuracy of a RTLS should be derived from the business requirements.