One thing to note is about things like "Master of the Kings Wardrobe" is that they often tended to mutate after a few generations into more honorific positions, either with no relation to the thing they describe or else meaning they are the noble who appoints (and possibly pays for) the people who actually do the thing described. Sometimes they would become hereditary. The nature of a feudal society (to use a problematic term) is that station is defined by service to someone more powerful and proximity of ones relationship with them. King's Cup-bearer became a common honorific title, particularly in the Germanic world. In England the role of head of the King's household management evolved into the office of Lord Great Chamberlain, formally considered one of the highest offices in the land and becoming so removed from the actual work of running the household that the holder appointed that the (eventually entirely separate) position of Chamberlain of the Household to do that work.
The Groom of the Stool, however, had a very desirable position that nobody in their right mind would delegate or allow to atrophy into a mere honorific one, having the intimate ear of the king and a very personal relationship with him. While this may not have been a sufficiently dignified position for the most powerful courtiers, magistrates, and lords it was a much sought after position for an ambitious man of slightly lower stature, usually someone who had been knighted at the least, likely patronized by and perhaps reporting to one of or another grandee.
