I second that. It's a bit surprising to me that teams could have such big PRs and branch stacks. I can only say from own perspective but I imagine this kind of nightmare would be our reality now if we didn't pay attention to improve the we work and use PRs along the way.

PRs work very well for us and if we find ourselves stacking them, then we keep an eye on getting them into master (yes, we don't use the 'main' bs) in reasonable order. Then Github is actually doing job for us changing the target branch once the underlaying changes are merged into it.