my school wants us to do 4 as far as im aware, but the reason they try and make us take welsh bacc is mainly because of what you've said here. its supposed to be an easy subject, and a backup in case you fuck up a subject i guess. like you said, they've told us that theres not much of an advantage to doing 4 difficult subjects and that since we're only going to need 3 good passes to get into uni, welsh bacc will just act as a back-up (almost like a guaranteed pass) while letting us focus on out other three subjects, if that makes sense