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While it is best practice, it is not 100% essential if your image train is not disassembled. I am using Voyager and it can automate sky flats very well so I shoot them in the morning after each session with the ASI2600 camera as they can be calibrated with bias frames where the ASI294 really needed dark-flats and fixed exposure length flat frames, so that required a flat panel. With that camera I shot flats with the panel once I was happy with target framing and used the same master flat until I changed something such as camera angle, or if I disassembled the image train given the chance of changed dust bunnies that comes with doing that.
Once you get up to speed with them flats are not hard to do, they can just become part of your routine.
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