So is, in fact, tenure. First, because most of the quantitative measures are not quantitative. Publications and conference presentations are not all created equal, and different sub-fields have different funding rates and different funding amounts. That is only 1/3-45% of the tenure portfolio. The rest is “student evaluations” for which the only known ways of trying to quantify this are known to be biased against women, minorities, is also strongly related to physical appearances. The last third or so is “collegiality” which doesn’t even pretend to be quantitative.
This is less true in the engineering departments I’m familiar with. Research dollars, publications, and student evaluations determine tenure in that order.