"Highs" are a relative term in this case. Even a system that rolls off at 6500 Hz can be made to sound brighter. Whether the brighter sound was the result of brighter speakers or (I think more likely) the result of people accustomed to listening to theater sound systems without the screen in the way deciding they wanted the same sound at home, the result would be the same.
Since the rolloff caused by the screen was compensated for by a circuit that was part of the projector one would've been unlikely to hear an EQed theater system were a screen not in place. And if one wanted the same sound without a screen as with one then one would leave the EQ circuit off.
The technical eveidence (which is scanty so far in this thread) would seem to rule against your theory. As for anecdotal evidence, well Norma Desmond ran silent pictures at home.
Myself, I'm wondering if so called 'West Coast" sound wasn't born more of studio playback monitors than motion picture systems; perhaps the JBL monitors that started becoming popular in the 1960s and had extended bass and highs compared to the earlier Altec 604. Just a'wonderin' ya understand.
Kind Regards
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