Curious record side labeling


Do any of the jazz gurus on here know why some double-set records have this curious side labeling where record 1 has sides A and D, and record 2 sides B and C? It does not make much sense to me, and I wonder what purpose it serves other than to confuse the listener. I noticed this with a couple of Coltrane records from the '60s, recently with "The Other Village Vanguard Tapes."
actusreus
Thanks guys. I suppose it makes more sense now, but I'm still surprised that record companies would label sides with LP changers in mind, rather than what made more sense for standard turntables, which surely outnumbered changers by a wide margin.
Post removed 
The only advantage to automatic sequencing is that it can be handy for listening to some operas. There are a few that have interesting opening material and great endings with a lot of "filler" in the middle. If you can just flip over a record to go from side 1 to 4 or 1 to 6 or 1 to 8, that might be an advantage--I might do that with, for example, Der Rosenkavalier."
Many of my gatefold albums from the seventies or before come in that format. Most of them are bluegrass music. I just love to play them on my good old BSR with a ceramic cartridge tracking at about six grams or more. The sonics are to die for!