I am one of those people who finds it easier to keep up with names than with letters.
I have to admit that I try to pick names out for my posts where they might "telegraph" some pertinent information about the person being talked about. A loud mouth with recidivist tendencies would be likely to come out being called Archie Bunker, or possibly Archie Bunker's cousin, Bubba Bunker. A recent example of a thread where someone used names mined from the popular culture as "shorthand" in introducing us to the situation's background and how it is playing out was using names from a famous comic book (Veronica, Archie, Betty, Moose, and so forth...........).
I can see where the disguises could help keep the issues simpler - but sometimes simplifying the issues means that information that is pertinent is missing. Getting in touch with a touchy/cranky older lonely person - may be something that you do only if you want to. But if that person is a close relative, then there is a bit of a bias to keep in touch with family even if they are hard to get along with at times.
A post about wedding etiquette and someone not being invited to the church wedding means one thing if the church is one that is open to all members of the public for religious ceremonies and another entirely if it is (example) a "sealing" for a couple in the Latter Day Saints where one side of the family is of another religion or atheist - ONLY LDS members may attend a sealing, period. So calling them Oranges and Apples is just going to require additional information to clear up what is going on.
Each poster gets to choose what information to include, disclose, obscure, or highlight - based on their choice for general advice, specific advice, or to conceal their whereabouts if the situation might be in the news or potentially explosive in some way.
An example might be someone asking a question that if it came out to the wrong person could hurt feelings...........or a legal case..............seems we've reminded more than one person to stop posting until AFTER a divorce or other hearing was resolved.