there are no rules, you decide. There is no silly question. That being said if we are building for more accuracy and detail, painting is essential. Models come molded in ONE color, nothing is ONE color. When you view the completed piece it just doesn't look completed. But its really your decison. Its a process , your process.
If you are new to modeling, the only rule you should start with is use a toothpick for applying glue. Squeeze a small amount of glue onto a POST IT NOTE , transfer the glue to the model glue point with a toothpick.
Here is a process I started to use many years back, if a model is supposed to be MOSTLY white, and it comes molded in white, I still airbrush everything , all sprews, white. Which White,? you have to decide, gloss , semi or flat . Later on I will paint componets with the proper colors.
If a kit comes in molded in a pastel color, such as yellow, I airbrush everything flat white . It is very difficult to cover YELLOW plastic or pastel colors with any paints.
Military Models, I first airbrush everything ( all sprews) with the final color, Olive Drab, German Grey, Sand, Tan whatever. I don't follow rules,. With Miltary colors , for me, once the entire kit is airbrushed the final color, when I assemble, I touch up the glued areas with the same color with a small brush or toothpick. Nobody knows ! I made up my own rules !
Have fun enjoy your time with the kit.