My rough expectation is that most sites are individual, while most hits are on 'corporate' material. Corporate sites by this definition are, give or take, those where the dominant affiliation for the maintenance of the site as indicated in the web content is to an organized group or a brand owned by such a group. Getting your site accessible without getting technical is a worthy goal which is beyond the current state of the art. This is particularly true for individuals. Corporate site development can be structured so only some of the people have to have the technical knowledge if the other people follow rules for their piece of the action.
Individuals have to do it all.
The sad truth is that avoiding technicalities is an unattainable ideal for this list in particular. The state of the art of accessibility is that unless one becomes fluent in the technology, one is not going to be competitive in producing web content with good accessibility qualities. There are tools that help a lot. However, they have to be applied skillfully. To be competitive one needs to master these among a range of techniques.