It seems many think this is the case. I don't.
(I also think the allure of "template-driven postmortems" unfortunately enables this poor quality to continue.)
Doing this well can be done, and the results are undeniable when this expertise exists!
We've seen write-ups that have many unique daily readers who are still talking about an event 3-6 months later.
"wait what? I had no idea it worked like this"
"this is exactly what our group was wrestling with yesterday!"
"I thought this was straightforward...clearly not!"