I spent some time talking about this with a family member that works in forestry. My takeaway was that the core issues are 1) it's labor intensive and expensive

I spent some time talking about this with a family member that works in forestry. My takeaway was that the core issues are 1) it's labor intensive and expensive to manage the burns, beyond what we have budget for now, 2) there's a liability+harm issue to work through (e.g. when a burn will necessarily put a lot of smoke into an inhabited area how do you manage that), and 3) the combination of climate change and many years of fire suppression mean that doing the burns safely is harder than it was say 50 years ago. It's really a political issue, that is to get broad support to spend more and have worse quality of life for a while in order to get the situation under control and in much better shape a decade down the line. Tough sell.