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that is the ideal yes. i guess i'm just lazy (and/or time poor_ for not taking flats every single time. I would definitely take them at the next available opportunity if i realised that by previous 'master flat' was no longer suitable.
I take my flats at twilight. Point the scope or camera lens at the sky (away from the sunrise/sunset) where there are no clouds and essentially 'even' illumination across the field. i then setup Backyard EOS to take 40-50 AV Flats (set the camera to Av and then it meters the frame to get the appropriate shutter speed for the correct flat illumination)
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