Everyone can do rituals and heal themselves. Is nobody better during combat and someone else better outside of it?
Well, everyone will heal. However, although everyone has the potential to do rituals, they still need to get the feat. And then learn the rituals. And be good at the appropriate skill.
Just like everyone can (in theory) use the Thievery skill, but some people actually have training and have focused in it and others haven't.
Cheers!