Yes, I think that's it. It is a well written article with well reasoned arguments that are hard for anyone else to argue against. In particular, I doubt that anyone else knows Unixlib as well as Peter. His comments on its problems and future development stategy are taken from experience that he alone has.
I think what Peter is doing is fishing for ideas, just in case he has missed something that will simplify the task ahead. For this reason he has explained things from first principles, to try to bring in non-programmers. But it is difficult to argue with the strategy of building on what is already there and lifting code from elsewhere when this can save effort.