Technical communications serve mostly functional purpose but there were technical documents that ascended their pure function. One of the most famous drawings in the European art history is, in fact, a technical document[0].
I also really love looking at arcitectural drawings, there are a lot of architects and drafters whose technical drawing carries so much artistic quality to it (and not merely quality of execution) that I personally call them artists[1].
And before I get mocked about whether code that makes a spreadheet software is art now -- I don't know, I am not a programmer but I think it can be -- surely there is something else to code than just the software it produces? Speed? Efficiency? Balance? Elegant architecture of ideas that says "yes, I know you, the next maintainer of this codebase, will need to extend it one day, and this is why I made it very simple for you"? It might not talk to an accountant who ends up using the spreadsheet but it can talk to another programmer.