My reply to this would be that you can have multiple pieces of paper / multiple backups for just pennies, so if one backup location burns down, you have another backup elsewhere. That's good practice anyway (e.g. in a flood, that metal plate can easily be flushed out of your home), but too expensive to do with expensive metal cards.

Now, here it gets tricky. How do I write my seed phrase to this device, that is supposed to be super offline and super safe, whilst at the same time needing to use my phone for the process? I will never ever type my seed phrase into a phone app, so what to do?
On paper, I can write with a pen, and even a USB thumb drive is writeable by a live Tails OS. Would I need a NFC chip for my offline PC? Does such thing exist and if so, is that open-source in its hardware and software / drivers?

Unfortunately, offline.