[Technologist]

Can somebody explain to me the technical reasons why the Tivo EPG can't dynamically be updated for schedule changes, as we are seeing at the moment?

In most markets there are few if any reactive channels and thus a newspaper like overnight 
download of EPG info is all that you need
So TiVo is designed like that …  It just runs by clockwork.

In Europe we have had Teletext fir programmes listings (and PDC (or VPS))
in analogue television so most broadcasters were made aware of the things
that needed to be done to keep the listings current  … And to trigger recorders
But unlike the USA they had no electronic listings  and the high penetration
of VHS / home recorder that we had…
Sadly many useful features of PDC were not  moved into the digital age.

But there was a very large audience who used electronic listing and thus expected
And got listings updated dynamically ..