What google is planning to roll out there is great but it in no way undercuts RAP.
Say you get a nasty cough, you google nasty cough, onset 2 days, chesty, fever, anything else that is relevant to your condition and google will give you a range of things it could be. you might be able to narrow it down but its highly speculative. A few coughs into Resapp and you got a instant diagnosis thats between 80 -100% accurate.