In article ,
Andrew Gideon wrote:

Yet the representative to whom I spoke claimed that there was a concern
that this would make the 430's UI too complex.
I don't understand this myself (esp. if they retain the klunky route entry
solution as well), but that's what I was told.

The 430 was developed by Garmin.
The 480 was developed by UPSAT and inherited by Garmin.
Two different, incompatible design philosophies.
UPSAT, the successor to APOLLO/IIMORROW had years of experience to hone
their design skills and produce a successful product that is intuitive
to use. The 430 was Garmin's first try. That fact that they are still
promising an upgrade that was to be delivered five years ago shows how
wrong their design philosophy was.