And that dynamic has changed a lot with the introduction of groups for determining state football playoff berths. Conference affiliation is secondary.
Now if we are talking basketball, then Conference affiliation is a benefit for schools like Xavier/ Wahlert (private) and West DBQ (public) because they play top level competition during the regular season and then drop down to lower class for state tournament rounds.
True.
I may not have all the details exactly right, but this is the way I recall things going with football classifications and districts.
Before, I think, 2012 all the 4A schools played conference football, while the other classes were in districts. You had the CIML and the MRAC on the west side, and the MVC and the MAC on the East. Teams like Xavier, Wahlert, and Assumption played a 4A schedule even though they weren’t actually 4A sized.
Enough complaints from schools in the west prompted the IHSAA to start 4A districts in 2012, but only for the west - the MVC and the MAC continued 2 more years (with Xavier reaching the 4A title game in 2012 and 2013). That was when Davenport Assumption, I believe, said they’d had enough of getting beaten on by Bettendorf and traveling to Keokuk and said they were leaving the MAC. That would have disrupted the schedules for the remaining MAC teams unless they played some cross-conference games with MVC teams. Xavier and I think at least one other MVC team said they’d only stay if there was no change to the MVC schedule.
The IHSAA had to step in to make sure those MAC teams weren’t left without games, so districts were instituted into 4A for the entire state beginning in 2014. Without the structure of the MVC remaining as a requirement, both Xavier and Wahlert made the decision to play in their proper enrollment class for football, instead of stepping up (which would have been more than one level up for Wahlert).
If the MVC conference structure remained in place, Xavier, at least, would have continued playing a 4A schedule. Without it, the administration thought it pointless to volunteer to play up a level when literally no other school in the state was doing that. And, in doing so, Xavier lost their metro games with Kennedy/Jefferson/Wash/Prairie, as those schools all said they only wanted to play 4A schools (Linn-Mar actually broke ranks and played Xavier a few times - and it’s also interesting that Kennedy & Jefferson decided it actually would be okay to play a lower-level team once Wash got reclassified).
So that’s the football deal. As you said, in other sports the conference slate remains intact, and yes that does mean an advantage for smaller schools like Wahlert and Xavier to play a tougher basketball/baseball/volleyball season before playing tournament games against teams from a smaller class.