TL,DR: You don't have to get upset every time I mention fountain pens. I know you're not a writer, and it's an invitation, not a demand.
Everything but the cloud is going to melt/burn in a fire. The vast majority of houses don't catch fire.
We have writing from thousands of years ago. Meanwhile, good luck finding anything to read your floppy disk from the 1980s or even 1990s. Most people don't even have a CD/DVD drive in their computers anymore. Even Microsoft products won't open their own older file formats, so you have to not only upgrade, but import and resave files each upgrade - or try to keep an ancient computer running. The notion that digital files will always be accessible is absurd - unless, maybe, you stick to .txt files - the only files that appear mostly unchanged since DOS days and that, I think, are compatible across OSs.
So, what, you're gonna refuse to read 19th century journals and letters? You'll be missing out on treasure.
Everyone has their own unique needs and preferences. I know full well that 99.99% of the population isn't going to use a fountain pen. But if it's a difference between not making a record at all, and making one on paper, the better choice is obvious. My invitation is harmless, and mostly teasing. You don't have to go all off on it every time I make it.
And if you need me to spell out the gospel-related good that has happened because I write with fountain pens and associate with other fountain pen users, let me know, cuz I've got some good ones. God can do His work, even through fountain pens.