Since the author is referring to a specific model, I think it makes sense to ignore how the model (or local models in general) may improve over time.

It's like buying a car: I drive that car and get attuned to its characteristics; I don't think how that car (or similar cars) may improve. That's my tool and I want to make the most of it.

It is true that switching a local models it technically very cheap, but there's a considerable time investment in squeezing the most out of it, which may not work on a newer version of that model.