In Australia there is more and more a network utilisation factor (not sure what the exact name is). In essence this is peak demand in a billing cycle does define the cost for the entire billing cycle. So if I have everything on at the same time I will draw lots of kWh, this will give me a night $/kW that I have to pay for my entire consumption.

So there is merit in keeping peak consumption low to not pay high just because of a single spike.

Never having dishwasher, washing machine and dryer on at the same time is a good starting point.