>there is absolutely nothing about retaining pagination (or linebreaks,
or end-line hyphenates) that "prevents reflow", jim, and i wish you
would stop repeating that nonsense…

As always, we talk past each other – I talk about problems in the real world, and Bowerbird responds with hypotheticals from bowerbirdworld.  Certainly current PG choice of linebreaks IS causing real world customers from reading PG books on their choice of hardware.  I know because I have responded to their complaints about PG brokenness on other forums. Real world customers just want to read books, they don’t want to have to route around PG damage.