I've always shut down my computer(s) using the standard Windows exit ceremony and left it at that. I'm aware that many / most of them stay in a partly energised state whilst still connected to the power, but I've never been concerned at what could happen because statistically the risk could be considered to be virtually zero.
Most of my amateur radio gear is treated the same way - shut off at the transceiver power switch - the 13.8 volt power supplies are all left in standby mode - active and ready to power up the connected rig straight away. I do this primarily because I trust my construction methods and have appropriate fuses both in the AC supply side of transformers and DC fuses and electronic 'crowbar' over voltage protection on the DC side. Some of my gear is on 24/7 anyway - specifically the APRS gateway and a Satgate and its associated pre-amp.
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