Simple question (I think):
All my gear converges on a single power outlet. Is there a significant difference between having that source on a power bar that I switch on/off and having a cord that I just unplug when not in use?
Right now I’m just pulling a plug to shut it all down….am I playing with fire?
I like having an on/off switch better, because pulling the plug is slightly more work than hitting the switch. 
…always a good thing to run ur equipment from one multisocket power bar that has it’s own fuse and plugged into some wall main power supply…so all ur gear gets powered on the same phase…
so if ur power bar is such a proper one, u can indeed switch on and off all ur gear at once without any worries via that one dedicated main switch…
while just pulling any power supplies instead of using dedicated switches can cause problems…sometimes.
but ifu do so, keep in mind, some of ur gear might need some save procedure before shutting down…and getting used to turn on and off whole rigs of gear via a one main switch can lead to…oooops i forgot to save this or that first…
and also keep in mind how much power all in all ur gear collection takes…if u power them up all at once, u got a proper energy consumption peak that moment, which could force ur main fuse to safety shut off…
This 
… model:cycles and samples definitely need it … and the habit thing is a good point.
Do you pull the Plug of your computer while it’s still running? It’s kind of harsh and may lead to lost data.
Be gentle to your instruments, they have feelings too 
Haha. Real talk.
I am using two of these 
for both my computer and audio gear:
This power strip has a current sensor connected to one of the outlets (master) and is used as a switch.
Whenever the current consumption is above a certain (adjustable) threshold, 5 additional outlets turn on. When the current consumption is below the threshold, the additional outlets turn off.
In my specific case, I use a pair Focusrite Scarlett 18i20 interfaces to mix and route sound from all my gear.
I have my interface connected to the master outlet and all the other gear like speakers and synths to the five controlled outlets.
I have an “all roads lead to Rome” kind of thing going on with my audio interfaces, so if they are not powered then I won’t hear any of my other gear - therefore for the most part none of my gear needs to have power if the audio interfaces are not powered.
As it is now, I set up the threshold so that when I turn on my audio interface, my speakers and other gear also receives power. When the audio interface is turned off, the speakers and other gear also turns off.
The power strip also has two permanent outlets, which you can use for things like a phone/laptop charger.
I have a very similar setup with my desktop computer, where the screens and some other things are cut off from power when my computer is not on or sleeping.