To partly answer my own question
> more importantly, can you (or anyone) start with examples of tei_all
> texts which are unuseable in practice without the To80% stage?
> practically, which elements or modules (collections of elements) are
> candidates for moving to the non-80% setup?
I am reminded that quite a few elements in the TEI are known to
be syntactic sugar or specialization. So <persName> == <name type="persName">
for example. Although my heart sinks at the work involved, we could/should formally
record these links, and then generating the programme which resolves them
is trivial. similarly <div1> == <div type="div1">
more generally, it's a truism that "with <div>, <ab> and <seg> I can mark up anything",
but reducing the whole TEI set to those three seems to go too far...
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