The "dot pitch" is a measure distance between two "reds" of the dots in the shadow mask or the width between two reds on an aperture grille (which is really only horizontal dot pitch). Since black and white monitors don't have either, they can get much much sharper because that layer just doesn't exist. It's limited only by the focus of the beam and bandwidth/ frequency of the signal.

(As my layman understanding goes that is)

Monochrome CRTs are delicious to look at. A feast for the eyes. I love them. Compact Macs are often the cheapest way to get them, especially for their wonderful paper white phosphor, though I'm a sucker for amber phosphor.

That is indeed something I had forgotten, having not had to think about CRTs in detail for a long time... Here's something from 2001 when CRTs were still in common use also with details on the differences between shadow mask vs. aperture grill CRTs.

https://www.tomshardware.com/reviews/a-thg-primer,393-3.html