There are high quality leather products that require a lot of maintenance, and low quality leather that requires little maintenance. If there’s any correlation, it’s weak.

Generally leather quality is based on the quality of the hide (what part of the hide, what weather conditions the cows lived in, what scars they had, etc.), the type of leather (full grain, corrected grain etc), thickness, and the quality of the tanning.

Yes you can judge leather by the amount of maintenance it requires, but you’d be eliminating many of the better options in other metrics.