What is the significance of single equipment intact rate and calculation method?

If it is practical, the intact rate is only a data index, as a method of assessment, but it is also reasonable. I think there are still some discussions about what costs and hidden costs this indicator has added to the company. I am also studying this intact rate these days, because each company's situation is different and there are many assessment methods, so we can't use simple intact rate to explain the equipment problem! Equipment management is a professional system management, which is ultimately measured by maintenance cost, use cost, feedback from operators and value created by equipment.