HI
The only time I recommended NOT painting , was when my class of seniors was building their first model . That was because where we met ,you could NOT spray anything there .I told them if they wanted to paint them take them home and do it there .
A few did NOT paint them . They were the OLD old , MONOGRAM fifties CHEVIES . They polished up nice in bare plastic , but , I go for the painted look . Paint seems to say , " okay , I'm finished " There have been a few times I did not paint a model as in the 1934 MERCEDES with " BODY by SINDELFINGEN " that was put out ,I believe by JO-HAN . It was molded in a very rich and deep burgundy that I could NOT match right away with paint .I built it between at sea deployments .
I tell folks today , "Paint that model , you'll be glad you did " Tankerbuilder