Think about having a switch on a laptop. And if the switch doesn't just kill power (which it shouldn't to safely shut down), then it shouldn't be a switch it might be better as a button.
I would prefer it to Windows saying, "Hey, I see you want to turn off this, ahem mobile, computer of yours. I'd like to comply, but you see, I have all these updates I'm 'bout to install for you so... yeah... Oh and don't even think of putting it in your bag because it's a Dell and they void your warranty if'n you do that. Mmmkay?
But doesn't the long press actually do that? Kills the power, if you really intend to do that.
The warranty thing is an entire Pandora box of discussion in itself
You want a switch that also kills power without software or firmware.
I had a Dell that once got stuck and the usual long press of the power button was not switching it off (probably it was sw/fw controlled). I had to take it apart and disconnect the battery, otherwise I would have lost my working day waiting for it to die.
Just like a sibling comment says I also haven't ever seen a case where a long press didn't turn a laptop off but i agree maybe a pin push button for hard restart might make sense in such cases.
We have some Lenovo ThinkPad X1 laptops that disobey the long-press. They get stuck in a state where they are turned on but appear off and nothing works. The only way to get them out of that state is the reset hole. Supposedly it's a motherboard fault, but they've replaced the motherboards repeatedly and it still happens.
P.S. Yer 'bout to miss your flight."