Sounds like you find the “ work around”. Drilling out the fixed restrictor in a remodel I finished recently, did improve the flow. I didn’t know about the cartridges I’ll have to look into that. And you’re right about the dishwasher I was wondering why my new one took so long to wash dishes LOL
Our old dishwasher took half an hour to clean the dishes; the new one that the wife wanted is stainless steel inside and out, cost a fortune, and takes 3+ hours to do the dishes, and you have to buy special detergent pods and a little $10 bottle of blue chemical that typically spills a bunch when you are trying to fill up the little container inside the door.