Tense and time-travelling

Today's episode of the Big bang theory reminded me of something I wrote years ago about time-travelling and tenses in human languages (I wonder if it's still available somewhere, I had beginnings of the listing of a 1000 and one useful verb forms for time-travellers) , that in turn also relates to how misguided even most of the school books about human languages are. One popular representation of this is people saying whether there's future in your language or not, like readers of language log are aware, even some respectable publications fell into that fake story about how English has future and languages that don't are economically worse. The scene on tbbt is about telling the time travelling paradox of back to the future with reference to alternate timelines, and it is clearly obvious that English language has necessary tense structures for telling combinations past future perfects (or what's its name, I'll look it up once the script or subs of the episode are online) as understandably as present, future or past or pluperfect. So what's the point of school grammar teaching that English has future and Finnish hasn't? There isn't, Finnish has plenty of auxiliary verbs as capable as English will for being explicit about future, not calling it a future tense is just good for silly false anecdotes about languages. And, by the way, the discussion about tenses useful for time travelling is ripped from The hitchhiker's guide to galaxy.