If a nib is scratchy and loud it can be a sign that either the tines are out of alignment or that the iridium tip was ground for feedback. If it’s the tines, then it will also sometimes catch on the paper - you’d notice it. The only Sailor I’ve ever written with that was a bit scratchy was an extra fine nib - I think that just comes with the extra fine territory. But that doesn’t mean they aren’t moderately scratchy Sailor nibs in other sizes out there, of course.
The best way to get a sense of intentional feedback is to test something like a Pilot 823 against an Aurora 88 - the iridium on the Auroras are ground to have a bit of feedback. They aren’t noisy, but you can feel the difference immediately if you write with those two pens back to back. I actually like both very much. I find that I have better control with the 88 - I also write slower with the 88, which is probably part of why I have better handwriting with it. But in terms of ease of writing, the Pilot 823 is hard to beat. Actually, I’m not sure I’ve written with anything smoother.
Re: Pelican - great pens, but they have some QC issues. Many of them need minor adjusting when they leave the factory, and it’s usually either that the tines aren’t perfectly aligned or the feed needs to be adjusted for better ink flow. This actually used to be normal back in the 1930s to 1970s - there were lots of pens shops and people bought them from a store that had a person who made those kinds of adjustments for you as part of the purchase. With the decline of pen stores, most companies have taken to doing this at the factory.
Re: the 24k gold - nibs have iridium tips, which is ultra hard. In terms of flexibility, they control that with the thickness of the tines, rather than gold content. Flex nibs, like those used for calligraphy, are made much thinner than standard nibs.