Possible damage to Rytm by not turning off power before unplugging?

[knh]

There seems to be no problem with using the switch on the power strip. See here:

Is it dangerous? [switching off power strip at wall]

I wonder if it is dangerous to let machines’s power switches On and then use the general switch on my power strip to turn them all at once. Does it make any difference? Are the AC-DC adapters actually working before we switch a machine On? Aren’t the AC-DC adapters good enough to stabilise the possible peaks that could occur when switching On the power strip’s general switch? What do you think?