111 call handlers aren’t supposed to diagnose you, that’s an unfair presumption in your title. They ask medics to call you when necessary, so you can discuss with a professional if the situation warrants it.
They’re not discussing your problem with you in an attempt to personally diagnose you, they’re reading questions prompted by their software to see where is the most appropriate place of treatment to forward you to. This apparently awful algorithm does actually work for the majority of callers, these incidents are rare outliers and therefore not indicative of the service as a whole.
I have never had a problem with it. When I specifically wanted an out of hours GP appointment, I told them and was given one once they confirmed I needed it. They only once told me to go to A&E, it was an unnecessary visit but due to one of my symptoms being a massive red flag their medic couldn’t recommend that I get seen elsewhere. It was annoying but understandable.
I’m not saying 111 is perfect, improvements should be constantly made. They should work on marketing so it’s more clear what this service does/doesn’t offer. They should always work on staff training etc. But it’s not as bad as some of you are making out