A NPS type of metric/score for UX maturity within an organisation

The NPS score, despite it's simplicity, appears to be a very good indicator of people's attitude towards a product or service (at least according to the marketing department). The value of encapsulating all the factors into a metric is that you can spend more time monitoring and tracking changes, which is the main benefit of a metric (to 'measure' and 'improve') rather than trying to work out exactly what the underlying factors are (which you should do by more in-depth research).

My theory is that you can also encapsulate an organisation's level of UX maturity by the simple metric of how much time a typical UX designer would spend with the user compared to the business stakeholders, and that you could simply express this as a ratio, with the higher ratio reflecting a greater level of maturity (i.e. more time with users compared to other stakeholders).

Based on your experience, do you think this is too simplistic to be applicable, at least compared to more complicated measures of UX maturity models (of which there are only a limited number of questions on UXSE).

Personally I think this is a reasonably good approximation that will give a suitable ball-park figure, but I would be keen to see if there are examples of companies with high levels of UX maturity where this rule of thumb does not hold true.