Right, so if you believe that, then you believe someone who fails to do that is doing poorly in their job.

That doesn't make them a hobbyist. It makes them bad at their job.

If you equate people who are bad at their jobs with hobbyists, it implies that hobbyists are bad at what they do which is simply untrue. Many hobbyists are very very good at what they do and they are usually free from the constraints that come with a job (e.g., doing what your manager thinks is important rather than what you think is important).

i'm ok with pushing the importance of accessibility for "websites intended for the general public", but there are a very large number of web projects out there with a very targeted audience that simply do not have the same accessibility needs as a large retail or informational or government website. Internal webapps for known users are what a lot of us are working on, and accessibility is often not much of a concern.