Farewell letter is such a simple thing to write though. Communication is such a key skill as an engineer I feel like letters like this should be personal.

I don't know, letters like these are often "heartfelt" which not all people are good at.

I actually thought about resignation letters yesterday for some reason I can't remember and cringed about the thought of writing it.

But even knowing this site exists I probably wouldn't use it, maybe it can be used to get some inspiration though.