Whereas I want my RPG rules to facilitate whatever kind of gaming I and my players feel like playing. Not a reality simulator. Just game rules with some versatility. If for some reason Proctology skill becomes pertinent to my campaign, I want my rules to support Proctology skill.More generally, I want my Traveller rules to be a framework that facilitates SF adventure gaming, and not a reality simulator. I don't need Proctology skill because it almost certainly won't come up in a game about Travelling. Neither do I need a Pebble-Dashing skill or a Fondue skill. (Cheese OR Chocoloate specialities...)
It's true that I can't imagine Proctology skill becoming pertinent to my campaign, but it would be a little myopic of me to think that only those skills that I have a use for are essential and that all the skills for which I have no use are unnecessary and that people who think otherwise are being silly.
Hans