Most of my stationary tools have been running perfectly fine for almost
70 years. Most of them are 1 hp or less, so no, they don't all have that option. Table saw does have the option and I'd thought about changing over to 240 many times but just never got around toit. Probably because the reward/effort didn't motivate me enough.When I bought my used shaper, it had those big red/green buttons that looked like those on the magnetic switches. I assumed it was a magnetic switch. One day I lost power and when it came back on, so did the shaper. That was the only time in my lifetime that happened to me, and it wouldn't have happened then if I knew the switch was not a mag switch. My newest tool is my planer, and it came with a mag switch, otherwise, I'm on my own to switch off power to all my tools.
So far, other than that one event, I'm doing ok. I'd say it's a good idea, but not a "key" item, at least not for me. If it was, I'da "switched" all the switches long ago:-)