Since we are talking about other hobbies that use brushes, there is another tidbit about fine painting found in Artist's books and articles.
That is that for fine painting, you don't get an expensive tiny brush,,,,,,,you get a good quality paint brush that can hold a fine tip, no matter what size it is. That is the part of the brush that really counts if you want to do fine lines, or tiny details. A tiny brush that can't hold a point isn't of any use for nearly anything, because it can't hold a point for fine work, and it doesn't have any paint reservoir to speak of for broader uses. Low paint holding volume causes more brush strokes showing, since you have more "dry time" as you paint, caused by the pause as you dip more paint into your brush. The paint dries more while you are at the pallette instead of on the model surface.
Also, there is a real large factor involved in brush life, caused in part by how you use the brush. If you aren't decanting paint into a pallette or cup, and decanting thinner into a pallette or cup,,,,,,and "tinning" your brush before loading paint into it,,,,,,,you are abusing your paint brush and causing it to last a shorter life. Only modelers and other types of "non serious" painters dip their brushes directly into paint jars to get paint on a bare brush and stroke it back and forth onto models. Everyone else "tins" the brush with thinner, loads the brush halfway up the wet area and retins as needed, as they work, and brushes in one direction without going over a previous brush stroke. We wonder how to get paint out from inside the Ferrule,,,,other brush users know they shouldn't be getting paint anywhere near the Ferrule in the first place.
And they paint without getting raw paint actually touching the brush bristles directly, there is always a barrier of thinner between their bristles and their paints.