I don't like buffets apart from breakfast, but any time I've looked at AI with a la carte, it's been very expensive.
I prefer to self cater and mostly eat out or Hotel B&B but always get a kitchenette so we can buy drinks and snacks from the supermarket. We tend to eat one proper meal out each day and then get ice cream/tapas/slice of pizza for the other meal. May cost about the same as mid range AI but the experience is much nicer.
But I don't understand the laundrette/luggage thing. There's another thread where people are going to all sorts of ridiculous lengths to avoid paying for a checked in suitcase. I don't want to be shopping for basics that I already have at home, wearing and discarding old clothes or finding and sitting around in laundrettes on holiday, so we always take one medium sized hold case as it's much easier.
You get rid of most of your luggage when you get to the airport, you only have a small carry on bag on the plane so don't have to queue up to get on so you can put the big carry on case in the locker before it fills up and you can take what clothes and liquids you like so you don't have to go shopping when you get there, compromise what you wear on holiday or spend time dealing with washing instead of relaxing.
But each to their own. If you want to eat out eat out, if you want to do AI, do AI, if you want to cook in an apartment do that. If you want to rinse your clothes out each night and buy a load of toiletries to leave behind to save a few quid on hold luggage, do that.