UX is the result of an in-depth analysis of all aspects of the product and the design team's work on a specific process, with testing on real users. If this work is not done - it is likelythat your product will not be as convenient as you expect.
UX is an investment that should pay off and can be predicted. Before the start of the work, a metric system is formed (for example, task execution time, number of errors, subjective convenience assessment, etc.) and each of the metrics leads to the growth of business indicators.