The basic limitations are there as well, like 100+ pixels per linear
screen
inch at best, as opposed to 2400+ on a lithograph printer.

This is a specious argument, at best. That and vector charts have
essentially unlimited resolution (granted, raster charts are being used in
the original post). The quality of detail varies based on the source data
and the chart provider. Some offer considerable detail. Digital charting
systems also afford a greater range of searching, both for route planning
and guide information. As in, find me all restaurants within 10 navigable
miles, Garmin's doing that sort of thing now on their latest chartplotters.

it is not everywhere and it simply is not ready for prime time.

Perhaps not for you. But people who actually use current digital commercial
charting solutions appreciate otherwise.

I think the half-assed hack using google data is just that, but do not
confuse it with what is actually being done with digital navigation tools.