Nice article but having been into mini pcs and fanless mini pcs for the last few years including modding them, id caution just like above post.
While these temps maybe ok for some time you can't predict external and even internal components always, even a hot summer day could leave 10+c internal temps.
Really passive is a bit of a fantasy, while workable its not ideal and some form of active cooling imo is always required otherwise you just end up with thermal throttling of the cpu or nvme or worse dead components. And that is coming from someone who owns a passive mini pc (Toptop FU3 8845hs mini pc).
If you value durability and reliability always stick with desktop PCs be it mini itx or micro or better full atx builds, and this is coming from someone who loves mini pcs:)
...and that is in controlled conditions. What happens to users that are in record-breaking heat territories?
I remember, there's was a time that any silicon that was reaching above ~76°c (oxidations, ect.), for extended periods, was frowned upon by... uhm... everyone. How times have changed. 😏
The Intel Arrow Lake mid-range processors are power efficient enough to run at sub-80° C temperatures in a quality fanless mini- ITX case from Turemetal. More demanding loads could lead to 80° C temps, but day-to-day use cases do not exceed 60° C.