@davidvujic Interesting. I think that big planning is "coming back", or makes more sense now, since the speed of execution has gone up in recent years. And with agentic coding, planning is a need; the agents do not know what to make without a plan.
At my work, we do scrum, but looking at the bigger picture, the product/UX, marketing, and sales teams have done a month or two of planning before the development team starts working. Then we do two weeks of work, then demo and retro. Adjustment happens during development, and you could argue that's what makes it agile. But we still have a big planning phase. It all looks a bit like a waterfall of smaller waterfalls.
I don't think big planning is an issue. I think the execution matters more. If management throws two months' worth of work into a pile and then lets the developers fight it out, bad things happen. Going agile when executing will make big planning a success.