Feathers are the things birds have that are part of their wing and help them fly. Pens were made from feathers at sorme points in history. I think the term you are looking for is nib, if you mean the metal part of a pen that touches the paper.

You have pens like the platinum Preppy and platinum plasir which have double seals around the nib. I left my preppy for an entire year and it still didn’t dry out. They aren’t the only brand to use tricks like this, my TWSBI Eco was also left for a year and was a-okay. It’s always good before buying a pen to check the reviews and see what their cap seals are like. Rollerballs do require less maintenance though you are correct. If you do leave a fountain pen and it gets clogged there are ways to fix it, as I had to do with two more of my pens that did clog when they were left with the others.

I’ve used cheap mechanical pencils before but not expensive ones. How much better are more expensive mechanical pencils?