One thing I've personally found about maintaining relationships is how much the fact that someone bothered to write something down about me is meaningful. There's a lot to be said for the clerical role in friendships. Noting someone's birthday, the things they like, their family life, etc. so you can write a card or just drop them a note on their birthday is quite the opposite of "reducing" someone to text in my opinion.
Are you though? You can just view the text as memories. Same as taking pictures on vacations: "reducing vacations to pictures" sounds like a pretty bad vacation/more like photography work. "Taking pictures of cherished moments and places" sounds like something you might look at again from time to time to fondly remember.