I am 47 years old and my vision sucks. It is no harder painting 3mm figs than it is, say, painting belts on 28 mm figs. Like everything in minis, it is a question of tecnique and not one of eagle eye sight and rock steady hands.
Paint for effect, not detail. That is the key.
O8’s 3mm figures are about 200 percent more detailed and recognizeable than Irregular’s 2mm figs.
We get slapped around, but we have a good time!