As usual, you are spot on. Those issues and others arise.
The original post appeared to indicate an ‘instead of ship’s equipment usage’, but that is only as I understood it and perhaps not as it was intended.
Regardless, many operations spend a lot of effort, time and money to keep appropriate portfolios onboard, the charts and pubs updated, both paper and electronic. Use of uncontrolled personal navigational software / equipment has no place for us, but that is our particular situation and is one that suits us.
Will computer based navigation software become so reliable and universal that it will be treated like parallel rules and dividers? That is all give the same results if you use them properly? Probably not - because the global market is too small to develop the complex solutions needed to keep charting software up to date.
I can see where it might be a good supplement to whatever is at hand. Just beware of liability concerns, because at the first incident, questions will arise …
PS - My wife chose the Mac.