I disagree with the “tapping on the shoulder isn’t a bad behavior”. It is counterproductive as illustrated by the linked cartoon.
https://heeris.id.au/2013/this-is-why-you-shouldnt-interrupt...
https://heeris.id.au/2013/this-is-why-you-shouldnt-interrupt...
Of course the right thing to do is to work to get proper visibility, and when you have that, then the "tap" is pointless interruption.