I'm glad someone started a pen thread. Thanks @Runnin_Ute for that.
In my view, writing with a fountain pen marries well with shaving with a traditional razor. I don't want to get too philosophical about it, but consider these points.
As with traditional shaving, it's contemplative. It slows your thoughts down and encourages you to focus on what you are doing right now. You have equipment that invites and rewards your attention.
As with traditional shaving, it's inexpensive enough to be a hobby to those who are so inclined.
As with traditional shaving, preparation is important, but not essential. You can pick up a fountain pen and go if you want to.
As with traditional shaving, it has gear. We guys love gear. Little utilitarian goo-gaws about which we can discuss the finer points with our gentleman friends. Little mechanical things that make our lives better. With lots of little variations to buy, try on our own, and ponder. I think this is genetic with men, and fountain pens feed that.
As with traditional shaving, it's traditional.
As with traditional shaving, you can go way retro if you want. DE/SE shavers go straight. Fountain pen users go dip. If you want an intermediate step, think lather catchers and lever-filled Watermans or Esterbrooks.
The history of fountain pens coincides remarkably with the history of razors. In the age of straight razors, dip pens were the norm. About the same time that safety razors came on the market, fountain pens arose. About the same time Bic ballpoints came on the market, disposable razors arose (not coincidentally, Bic disposables). About the same time modern gel pens came around, cartridge razors came to the market.
As with traditional shaving, what was once a daily drudge becomes a hobby when one gets into pens. You have RAD? Meet PAD (pen acquisition disorder).
As with traditional shaving, complementary accoutrements become important. Shavers fret about soap and brush variations. Fountain pen users fret about paper and nib variations.
As with traditional shaving, there has been a modern resurgence of fountain pen varieties and availability. Google it.
So if you like traditional shaving and haven't yet discovered fountain pens, open your wallet without much strain and embrace the fountain pen.