flexible

I noticed one of my wings (XDEEP Hydros 40) came with a really nice and flexible rubber LP inflator hose. I have a bunch of other spare rubber hoses and they all seem significantly stiffer compared to that one. So I was just curious if there was somewhere I could buy these nicer flexible hoses?

When I started diving (10 years ago) I purchased solid (ie. no flexible rubber sections in it) fins. I was in the dive shop a few days ago and was looking at all of the modern fins with flexible rubber sections in the middle and all sorts of advertised advanced channels. Is it worth upgrading...