Ok so what's the deal now with Kaladesh?

I never was invested that much in Kaladesh but I am really curious now. I know it got renamed to Avishkar and I even know why. I like both names. But what's now the deal with Kaladesh? It's now a different plane? Wizards say it is the same plane but with a different name. And I am okay with that but what's the lore reason? For example we had Mirrodin, right? After Phyrexia attacked and conquered Mirrodin it became New Phyrexia. That was a lore reason why a name changed. So what's the deal with Kaladesh? Is there some new political power that decided to rename the plane? Or was there some event that triggered the change? Because lore is important to me and if there isn't a lore reason and it's only because of our real world, it's stupid change. Because I play Magic to escape reality not to be reminded that everything sucks and everybody is offended.