I can see lots of good points here. Also, I think there are people with different goals here, and I like that. For peaceful, mutually respectful good times, I think it's important for it to be ok that one person says "expert" means x, y, z, and another person says it can also be a, b, c. Usually, they are talking about completely different approaches and goals, and I see nothing wrong with that, provided there's respect for the differences.
I was married to a guy who could play the electric guitar in a band really, really well. He liked all the high priests of virtuoso electric guitar. He learned everything by ear, or with tablature. He couldn't read music. But he didn't have a huge chip on his shoulder about it either. He had great respect for academic musicians, and even wished from time to time that he were inclined to learn how to read music. But he chose not to, and that's ok. He did not claim to be either better than or worse than the people who could read music, because that's neither here nor there. One of his guitar heroes had a PhD in astrophysics (Brian May) but could only read music slowly. Another hero couldn't read music at all (Eddie Van Halen). Eric Clapton couldn't read music. But Steve Vai, who learned from Joe Satriani, went to Berklee and from what I could dig up, could read every single part on a symphony score. I spend an awful lot of time online looking at videos of musicians doing their thing, and I can't say there's a pattern of this guy does/doesn't read and therefore is/isn't more virtuosic or more emotionally connected to the music. For each musician, there are just trade-offs. Pretending there aren't trade-offs is magical thinking.
Describing what those trade-offs are seems to be an art form in itself, and a neverending source of conversation, which I think is good news. We'll never run out of stuff to talk about. If we can talk with mutual respect (like what's happening here so far), without the big chips on our shoulders, we'll probably learn a ton from each other and actually make friends with one another, instead of perpetuating a culture of competition, put downs, and fear. I came here to get away from that.
Imagine the difference:
"If you want to be a 'real' pianist, you have to do x, y, z, or you'll fail, you moron."
or
"Here's how I got where I am, and so-and-so whom I admire very much, does this, that, and the other thing, so I'm going to try those things and see what happens. What do you think of that?"
The first conversation makes me want to quit the internet for good. The second makes me keep clicking refresh to find out what happens next.