I have a first gen iPod Touch somewhere in a box here. It was press once to lock and turn off screen. Hold to get power menu.
Fucking hell, Samsung? I'm typing this on a Galaxy A52 5g. Same thing. Press power to turn off the screen and lock, press and hold for power menu. They did have press and hold for bixby about a year after I bought it, which I disabled, but it wasn't out of box default.
I've never encountered this multi-button power shit you're talking about outside of old click wheel iPods, or as the force shut down option (equivalent of ripping out the cord on a desktop PC, definitively not the normal/intended power off procedure).
Don't know what you've been using, but this has not been some standard thing forever.
Does that actually bring up a menu, or just outright shut it down?
The two button shortcut has historically been for forcing an immediate shutdown in the event of like, a full system freeze. It's the same as ripping the power cord from a running desktop PC, and isn't the intended graceful shutdown that these devices are supposed to get.
Unless they've changed things, that's been the standard since the first smart phones and PDAs.