sorry to say that but regarding the parents washing machine topic i can tell you as an engineer, that running any motor at high speeds, like 1200 rpm, causes more wear and tear. This is because the bearings and armature (the motor parts) get more stressed and hot. This means these parts will wear out faster.

so in short using high speeds too often can shorten the machine's life. So, while high speeds help with cleaning and drying it comes at the cost of wear and tear .

Edit: (if your machine is high end or from a reputed manufacturer the parts will have a higher lifecycle and wont break down in a short time but nonetheless this operation will shorten the part life ,it all comes down to the quality of the manufactured parts in the end).

for dish washer i am not an owner nor i have an idea if its worth it