You care about binary size is probably the first one. In my experience, increases in binary size cause an exponential increase in link time. You may have licens

You care about binary size is probably the first one. In my experience, increases in binary size cause an exponential increase in link time. You may have licensing restrictions (LGPL for example), or be using a binary thay was provided to you. Your source code might be set up in such a way that a monolithic build doesn't make sense.