Spoken like someone who takes all of the technological progress of the last centuries for granted. And I don't intend that as a personal attack. Many, many people think like you do, because they can't even begin to imagine a life without the fruits of progress. As for myself, I'm eternally thankful for that progress, for without it, I wouldn't be alive today (appendicitis), neither would my wife (also appendicitis), and probably neither would my two children (historically, most children died within a few years after birth). I'm also extremely thankful for not having to fear death from starvation (thanks to agricultural progress) or from bacterial infections (thanks to antibiotics).

> But if we are just developing it without real purpose [...]

That "if"-condition is doing a lot of work in your sentence. Kind of like saying "if technological progress wouldn't be bringing all the immense benefits it is bringing, it wouldn't be so great".