let's say there is a site about fruits, with a comprehensive page about apples. In only one sentence and only once "banasas" are mentioned on this apple page.
Would you link internally with "bananas" to the bananas-page?
Of course this is possible and not bad, some user may be interested in bananas as well. But is it a good link in terms of enough relevance from the apples page? As the apple page is comprehensive, nearly all of the fruits are mentioned there once, anywhere. Doing the same with all and how to choose?