I'd call the ST VI bunks an example of "retconning without retconning" (i.e., something being presented that differed from the Trek universe as established) save for the fact (recently brought to my attention) that Making cited officers' quarters, as opposed to those of "crewmen." On that basis, I'm open to the possibility the TOS E had lower ranks in bunks.
Otherwise, I see no reason NOT to ignore "half the evidence" if the latter half is based on some director ignorant to an established Trek practice saying, in effect, "let's have a bunkroom scene, just like in the Navy."
I've watched every episode of every series, each of which (series, not episode) I've enjoyed. I've my take on good and bad films, but enjoyed them all as well. But social practice (private rooms for all) going backward (to bunkrooms) doesn't make sense to me in sociological or fictional terms. Similarly, we see nary a cigarette in TOS, but can read a sign saying "No smoking on the bridge" in TWOK. Should we retcon TOS to include smoking based on Nick Meyer's saying, in effect, "No smoking AT ALL? That's just silly"? I'm dubious.
It's not that I hold TOS up as the "real thing," the others as johnnys-come-lately. It's simply that I hold accidental (inattentive) violations of TOS canon to be due less respect than TOS canon itself...an argument little different, in effect, than those applied to ST IX (though in fact different in principle, being as how ST IX is in fact a retcon, pure, simple, deliberate, and absolute).