I would agree that many (or all?) appliances have some sort of protection including the power supplies of electronics.
For me, Im still crazy as almost a hobby having most everything on a surge suppressor, inexpensively will beef up whatever is already there.
I have so many it would be a task to count them all. *LOL* An example would be the desktop Mac I am typing on right now. Critical stuff like this I have many. My desk set up has a plug in surge, plugged into the wall plug in surge is a commercial Belkin power strip surge, which all power cords are plugged into but then the most critical of all I have the Mac mini plugged into a small Tripplite surge suppressor that is plugged into the Belkin Power strip surge that is plugged into the wall surge.
Now multiply that by two for my wife's desktop Mac on the other side of the room. Also in that room is another plug in surge suppressor that has all our low voltage stuff plugged into like chargers ect but plugged into that is also our laser jet printer and I have another small tripplite plugged into that and the laser printer into that.
Much of the home network the same way, I even have the garage door lift plugged into one on the ceiling.
I always wondered about one thing, I guess it's something no one else wondered about, cant find one comment about it on the whole internet. I always wondered with all these suppressors plugged in if they would help branch circuits or devices with no surge suppressors suppress spikes too. After all a whole house suppressor in a breaker box is considered effective, so I can only assume suppressors plugged into branch circuits are an extension of the breaker box and must or might afford some protection to other branch circuits
(yes I think too much)
I do have a wall mounted mid to upper tier Sony TV where it's not as possible to put multiple suppressors and for that one I have a dual outlet, plug in wall, Tripplite Isobar surge. (really heavy duty, comes in alum case I think too)
Part of the suppressor thing is also for line noise filtering and get the very best performance, whether its the internet network or TV .
COme to think of it, the only devices without a surge in our home are the HVAC and Dryer. I know I will most likely put a weather proof surge on the outdoor unit which should I assume cover the fan in the evaporator in the attic as well. *LOL*
Ohh no, I dont have on on the dishwasher .. oops, yes I do