I really miss the "snoring" light that Macbooks used to have, though more to tell if the computer is actually waking up.
Sometimes it seems Apple is just minimalist for the sake of it. Because this is really a useful feature.
But I do very much like them, and would happily pay a bit to get it back.
And a hole with a plastic insert would be fine for me too. It wouldn't be as minimalist but not doing it at all is much worse IMO.
So kinda yes... but also kinda no, I don't think that really supports a claim that it's cheap enough to do everywhere.
But yeah, I'd totally be fine with an LED glued into a hole. The indicator is the important part, and it's a shame that it's gone.