Ok, clickbaity title aside, setting the Mac Mini up like this raised my wifi strength from under 60 % to 93 % and extended my Bluetooth range from a spotty 1 m to rock solid whole room coverage. It runs noticeably cooler and I have easy access to all the ports and the power button.
This is a 2020 Mac Mini (Edit: 2018 model, march 2020 revision, not actually a new model), the last Intel version, hence the obligatory egpu, but the basic layout of antennas and thermals seems to be pretty much the same even in the new redesigned Minis.
The reason for the wireless performance increase is, as far as I can tell, that Apple used the bottom plate as the antenna and if you place the Mini on your desk in the normal orientation, that antenna is only showing a super thin profile to your wireless router / BT device. Plopping it on its side, I have increased the relative antenna size dramatically.
The effect on thermals is less dramatic, but giving the bottom intakes easy access to open air and turning the exhaust up makes it easier for the machine to cool down, the fans don't have to work as hard.
Now, if your setup works perfectly, that's totally fine, but in my opinion, Apple should change their marketing materials because the machine just works better this way 😁
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