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Sounds logical to me.
What I aim for in a single colour sub is to get B sufficiently over the read noise, then set each channel to the same exposure time, for simplicity.
OIII happens to be slap bang in the middle of the peak QE for the sensor, whereas Ha and SII aren’t, but it doesn’t really matter. I aim for a given noise reduction factor / SNR in each channel stack, and of course that will vary by object also, especially so in narrowband.
With RGB or narrowband you’ll be wanting to colour balance appropriately, which will scale the intensities of each channel accordingly. That eliminates the sensitivity footprint, although I’m sure if you looked at the noise you’d be able to tell which band the sensor was weakest with.
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