Better standard of care all round, blood tests/imaging tests seen straight away, you'd see where symptoms have been discussed previously which may have been dismissed but are actually relevant when looking at the bigger picture... it would just be awesome!
And in the case of my clinics, dealing with possible fabricated illness, child abuse and chronic fatigue with strong history of lack of engagement... all this could be seen, everyone would know... children would be that much better protected because the more the professionals know the more you can safeguard and all highlight the same concerns.
Like I said, just wonderful.