It's really not very ergonomical. It makes more sense to run it upside down, so the power button is actually reachable without crouching down and lifting the device. Is this somehow detrimental to the airflow / cooling?
Probably negligible, if any.
Now it sits upside down next to my Wii U above the Onkyo Amp. Both of which have the power button in front for easier access.
Depending on your environment, the upside down orientation may cause additional internal dust buildup (i.e., settled/settling dust would be pulled in more easily).
As for button accessibility, there are plenty of options. Vertical orientation doesn’t require a stand. In my situation, I re-used/repurposed the
vertical stand I had been using with my 2012 and 2020 (M1) Mac mini.
I sometimes accidentally press the power button when I grasp the mini to plug/unplug a peripheral.
I turn everything off I don't need.
There is no benefit to leave it running.
For the most part, I agree.
30 seconds of air conditioning will probably use more power than your Mac mini uses in a month. And the reboot cycle when you turn it on might consume more power than you save by turning the mini off. Don't forget the extra power your router will consume when the Wifi has to keep reconnecting. This could add up to 50 cents a year or more.
The potential bad (and good) of that mentality is that it can (and often does) spread. As you’ve somewhat described, this device/gadget/appliance/what-have-you only requires this little bit more if only I do this. But it adds up. Same thing for shopping and other expenses, “It’s only one more dollar."
For me, it’s mostly in the positive/conservational direction...
I often shut down my Mac before going to work and before bedtime — that’s presumably ~16 combined hours, 2/3 of a day. Admittedly, I have considered unplugging the Internet gateway/wireless router/AP when not at home. Furthermore, I have my computer display to ‘sleep' after 2 minutes. Thanks to HDMI-CEC, the TV and AV receiver are turned off/set to low-power standby when the Apple TV sleeps. I typically turn off the lights before exiting a room. I don’t use
Instant On for Xbox or Fast Boot on my PCs. I have several LED nightlights so I rarely need to turn on the regular room lights. In the summer, I minimize AC usage, almost entirely off during the daylight hours with the thermostat set in the 70s at night, whatever feels minimally comfortable at the moment. In winter, I rarely use whole home heat. For one, I live in an apartment, so only one exposed side. My ~800W consuming beast of a PC produces a good amount of heat; it runs FAH overnight (in cold months). I occasionally utilize heating pads and other focused heating items. I could go on and on but that’s most of the energy-related stuff.
Definitely, some of those actions are atypical and/or compromises, good and bad. There really is no perfect approach/method.