Any reason you can't use washing machine hoses for bath taps

[dextrous]

Probably a really bad thing to do for many reasons but I've got a couple lying about, so.... The pipes are terminated in compression joint iso valves. (Yes I'm cheap, yes I choose shortcuts over doing a proper job, no I haven't got a clue what I'm doing )

As you've gathered by now, it's not an oft used method. Think I'd be worried about the longevity of it - after all, washing machines and even dishwashers tend to get repaired and/or replaced every few years which means that these hoses tend to get replaced at the same time. In any case, they are more likely to be more accessible then under a bath, and since bathrooms tend to be upstairs and kitchens downstairs, a leak will be potentially more catastrophic.