The materials suggested are examples only If somebody, somewhere is printing something else with the UM I'm all ears.
From what I have read it seems the biggest trouble with HDPE was the smell and the very severe shrinkage. Though recently there doesn't seem to have been much talk about HDPE prints, so the information for the most part is all about the early days of DIY printing.
I guess it is also a function of how easy it is to get filament for a given material.
HDPE should be easy to print, around 130C(???)
The V2 hotend should allow higher temps (adjust the maxtemp in your marlin FW), since the PEEK doesn't get so hot, so you should be able to print PC (but I have no experience printing HDPE or PC)
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