Sounds like you already know that hypoxia induces increased erythropoiesis. I think what the doc was telling you is that 1400-1700M is not high enough for this to be an issue. That would presume that you are in reasonable good shape and do not have any breathing issues like COPD.
I would say go enjoy the skiing. I asked my MPN Specialist about low-depth scuba diving since some way we should not do this with ET/PV. He said it would be fine to do it. I am looking forward to a post-COVID cruise where I can learn to dive. It is one of the items on my bucket list. Then it is on to sky-diving.
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