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I can wait to vacuum for shore power or when the engine is running
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Even with the engine running what size alternator do you have to compensate for an 83 amp load and what's it's effective output at 2000 RPM? My 100 amp alternator dyno'ed at 50 amps @ 2000 RPM. That assumes a flat battery bank connected. A reasonable residual charge in the bank and the alt output will be less.
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Refrigeration has to run 24/7.
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During periods when the boat is not in use and/or away from shore power as in the case of a mooring there's always an 'off' switch on refrigeration too. It can be reserved for weekends or cruises. It all depends on power management strategies, same as vacuuming.
I wasn't saying one is better or worse than the other. They're both heavy hitters when it comes to power consumption but much like the gas/diesel tug of war, refrigeration is often disdained while other heavy loads aren't.