Are letters romantic in this day and age?

I recently contacted an old 'friend' with whom we argued three months ago but we haven't reconciled until early September. Since then, we've messaged pretty much every day, even agreeing to send letters to each other (we both posted our letters on the same day).

Don't get me wrong, we both talk to each other about our love lives in detail and other stuff too, so we are friends for sure. But, is this normal to exchange addresses, because we did flirt back and forth and then just lost touch. I have exchanged addresses with other friends, and it was platonic. But in this case, it feels a little romantic, and just wondering if I am overthinking it or not.

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Thank you to everyone for your comments. I should have clarified if the gesture was itself romantic, but I appreciate your opinions!
Are letters romantic in this day and age?
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