Dis I read the report on PM's talk correctly, and did he really suggest limiting disc partition size to that od a CD ROM (700MB). I don't like this at all, it would be horribly restrictive. You would be for ever running out os space in partitions and having to rearrange things. No, I can't believe he really suggested that.
I too don't like the idea of adopting a PC file format. You can, as mavhc pointed out, already read RISC OS formatted drived inder Windows, should you be perverse enough to want to do such a thing. I much prefer to have a filing system that doesn't fragment files.