Can cause some headaches if it’s a A321, people start moving zones, then it takes a million re counts until some crew figure out what the heck has gone wrong, you can ask pax a million times on the blower who has moved seats nobody will own up until you go row by row. To keep it easy for crew who rotate between different sized fleets, just sit in your damn allocated seat. Sure, other carriers do weight and balance many times better, but just gotta deal with the systems that exist. Poor software is another thread in itself.