With that amount of chemicals, any machine should have shifted those stains! Personally, I wouldn't have bothered with the stain removers and just done a long 60 cycle with the bio powder.
Although neither of us have manual jobs, my other half is an exceptional but messy cook and uses our tea towels for some horrific jobs (like drying out courgette's to make fritters with, as he did last week). I've never had a problem with any stains not coming out with just a decent bio powder.
Whilst I agree, the Miele is an exceptional machine, I was more than happy with my partners Beko that we were using for a short time when we first moved in together. We only kept the Miele as it's still under warranty. Whilst I do love my machine, I don't think it's essential to buy a Miele just to get good results. There are other brands that wash just as well. Although I completely agree with you about the Hotpoint, a lot of the newer machines spend more time soaking than they do tumbling. Classic Indesit trick.