The sugar/carbs in RB really aren't important to me. That's not why I consume it.

Further, your point isn't new. Comparisons by serving or by volume with many sugar cereals might suggest that your initial assertion is true (here's an example, https://www.today.com/news/raisin-bran-among-5-worst-cereals-your-diet-wbna39104129), but comparisons should be done gram to gram. One serving of Post RB is 61g. One cup of most sugar cereals (i.e. Reese's Puffs - 31g) is substantially lower than that. It's not an apples-to-apples comparison as is often spouted online.

Dig up a list of gram-for-gram sugar cereals that measure out well with RB in terms of calories, fiber, protein, etc. I wouldn't be surprised if they exist, but I'm curious if you have any reliable data to back up this hot take.