So your argument against technical writers is that you've had bad experiences with FAANG technical writers? And you think developers always have the time and skill for writing proper documentation? I wish that was true.

For certain types of documentation you need technical technical writers - for example, see http://hackwrite.com/posts/enough-to-be-dangerous/. And you need a proper content strategy / information architecture in place. Blame your recruiting managers and whoever wrote the job descriptions for not thinking about that.

Edit: And of course you need to allocate developer time. It's called knowledge transfer.