That sounds like saying "we don't understand this thing yet, so we shouldn't research it" (even if researching it will lead to a better understanding of it, given enough time).
It does to an extent and that's bad. Research and finding things out are good if not always then most of the time. If it leads to better understanding minds then great, I just think uploading suggests a conclusion about what minds actually are.
The International Journal of Machine Consciousness recently published its special issue on mind uploading. The papers are paywalled, but as the editor of the issue, Ben Goertzel has put together a page that links to the authors' preprints of the papers. Preprint versions are available for most of the papers.
Below is a copy of the preprint page as it was at the time that this post was made. Note though that I'll be away for a couple of days, and thus be unable to update this page if new links get added.