IMO, there's a difference between expressing a feeling/idea and skillfully creating a work of art.
Years ago, drummers reacted when some musicians tried to use drum machines to replace humans. Drummers said, "It's not the same thing! You're missing out on the artistic feel that only comes from years of experience, hardwon skill and (near)human intelligence!" In certain styles, it turns out that no artistic flair or skill is required, so a drum machine works perfectly well in that genre. In other styles, however, no software on the planet can fully replace a highly skilled musician.
I don't play guitar. If I want to record a guitar part, I have a few choices. I can bring in a guitarist or play the part on a keyboard. If I play it on a keyboard, I can use some rather cool software to emulate the sound and feel of a guitar, but it will not be a guitar. I may be able to express my ideas and my feelings through the simulated sound, but it may not have the impact that a real guitarist could bring to the piece. A musician with extensive experience and skill can do more than just play the part. They can interpret it, adding their own artistic flair or their signature sound to it. Without that skill, the part remains a semi-automated attempt to emulate the real thing.
I don't think most musicians react against advances in music technology out of fear. All the musicians I have ever known react because they know that a certain degree of skill is necessary in order to play with excellence. The concern is not that someone else is making music without paying their dues. The concern is that some people are being sold a lie that they can take a shortcut to being musicians.
Let's put this in another context. Jud is a dancer. He started when he was very young. He studied at the finest schools, danced with prestigious companies, and is considered by his peers to be an expert in his chosen styles of dance. Bo is not a professional dancer. Bo can do the Robot, though. Bo is not a stupid person. He is merely ignorant of dance techniques, mechanics, and styles and does not have the associated body/muscle control because Bo has not invested the time, energy and dedication necessary to learn them. If Bo attempts to choreograph a routine for Jud, his ideas will not be well received because he is ignorant. It is not because Bo is stupid, but because he lacks the knowledge and expertise to speak with any authority or competence in this particular area. I'm not saying this exactly matches the scenario described earlier. I was just trying to put this into another context in order to promote understanding.
Since I am not a guitarist, I would never dream of telling a guitarist how to play. I respect their craft and their artistry too much to insult them by insisting that I know more in my ignorance than an expert. I may play them chords on a keyboard or attempt to sing a melody to give them an idea of where I'd like the part to go, but the actual translation of that idea into reality is done by the guitarist and not by me.