This is from the 2023 NCAA selection website:
“Among the resources available to the committee are an extensive season-long evaluation of teams through watching games, conference monitoring calls and NABC regional advisory rankings; complete box scores and results, head-to-head results, results versus common opponents, imbalanced conference schedules and results, overall and non-conference strength of schedule, the quality of wins and losses, road record, player and coach availability and various computer metrics.”
So yes SOS is used and it’s your opinion that it’s a crap argument. Seems to me it would be very useful for say 2 similar teams from different conferences vying for say a top 4 seed with the S curve. One of many factors yes but it’s clearly important.