Is growth always a matter of maturity? Then you must define the end state: death.
“Organizations are seeing the value of hiring user experience (UX) professionals and incorporating user-centered design. Big name companies such as Google and Apple have incorporated UX design as a centerpiece of their successes. The overall maturity of UX design in creating software and technology has made huge leaps over the past few decades. However, like any function or practice, not all organizations have adopted or embraced UX design to the same degree or at comparable levels of maturity.”