It is that, just not only that. You saying dialogue is "just another sound effect" collapses all nuance out of a broader artistic preference on Nolan's part for authentic performance recording and diegetic sound (of which the dialogue is one part of many). You may not care about this-vs-that filmmaking choice, but they are intentional decisions with a rationale. In a movie theater setting, the problems introduced by these choices aren't as acute because there is a physical and spatial separation between speakers dedicated to primary dialogue vs environmental sounds, etc. The same is true for scenes being "too dark" or characters being framed too widely to read their performance because it was framed for IMAX not an iPhone.
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It is that, just not only that. You saying dialogue is "just another sound effect" collapses all nuance out of a broader artistic preference on Nolan's part for authentic performance recording and diegetic sound (of which the dialogue is one part of many). You may not care about this-vs-that filmmaking choice, but they are intentional decisions with a rationale. In a movie theater setting, the problems introduced by these choices aren't as acute because there is a physical and spatial separation between speakers dedicated to primary dialogue vs environmental sounds, etc. The same is true for scenes being "too dark" or characters being framed too widely to read their performance because it was framed for IMAX not an iPhone.