http://bellacaledonia.org.uk/2015/12/16/ootland/ A rather good article on the subject. There is a theory that the reason that the Celtic nations produce such a high percentage of famous poets, writers and playwrights compared to England, per capita, is down to the differences in grammar, syntax, lexicon, etc. that we all develop growing up. Phrases that are used every day in Wales, Scotland and Ireland make absolutely no sense in English (eg: using "How come?" as opposed to "Why?" in Scotland as an obvious one) so, when writing, they have multiple choices already in their head (dialect and 'proper' English) to choose from but also an inbuilt ability to weave around rigid ideas of grammar and language that "pure" English speakers need to learn. I think too many people look at the idea of languages from a purely vocational outlook and, equally, there's some who look at it from a purely artistic outlook. There are follow on aspects to knowing an extra language, even a dialect, that are beneficial from many points of view. Only a fool would dismiss them outright.