Yes, and I only play wood bagpipes because Delrin pipes are much heavier.
It doesn't make sense for makers use the same wall-thickness they use for wood, when using a much heavier denser material like Delrin.
There is one maker, Roddy MacLellan, who makes a thinned-wall composite Delrin Highland pipe. The outer wall is thin Delrin, the inner wall is some sort of polymer which gives a warmer tone and absorbs moisture (condensation buildup is bad for stability of tone). These pipes are lightweight and sound quite like wooden pipes. https://www.maclellanbagpipes.com/revelation
Right, I gave up flute and switched to Low Whistle around 2005. The issue is ergonomics. I still try flutes whenever I encounter them. I've given a blow on dozens of plastic flutes over the years, all of them were very heavy. I think a lightweight flute might be do-able for me, probably either boxwood, aluminium, or a thinned-wall Delrin.
Thanks for doing the flute weights! I'll check that out.
I think that's to be expected if they're using wood flute OD's.