Because it’s not a traditional forest, it’s a desert. We had a wet winter here, which allowed non-native invasive plants/grasses to grow abundantly. Those grasses are dead, dry fuel now, allowing the fire to burn hotter than it would normally, which makes it harder for individual specimens to survive the burn. The intense fire heat also changes the nature of the soil itself, causing more water to run off rather than being absorbed. Desert topsoil in this region has a unique, delicate balance already, even footsteps or tyre tracks can disturb the biome for decades.
Compounding that, climate change has already shrunk the area where slow growing Joshua Trees can even survive. The trees lost in this fire will not grow back. You can still easily see burn scars from the 90’s in Joshua Tree National Park, which is adjacent to the Mojave National Preserve.
I don’t know what OP might be thinking of, but I can give you an example. DSM-5 does not recognize Complex Post Traumatic Stress Disorder (C-PTSD), which is associated with chronic traumatizing experiences (e.g., victims of physically abusive parents, victims of sex trafficking). The diagnostic criteria would be different than the currently recognized PTSD, which tends to be based on one or a few traumatic events (eg., soldiers/survivors of war, car crash, rape). Since it’s not recognized, many people who have PTSD-like symptoms but who don’t fit the current criteria get diagnosed with anxiety or other disorders, and subsequently don’t get access to the most effective treatments. CPTSD exists on a spectrum from sub-clinical to disabling, just like PTSD. People on the extreme end should get the necessary accommodations for their disability, but without the clinical diagnosis are often expected to kind of suck it up in the “everyone has anxiety” kind of way.
Bessel van der Kolk and other mental health experts/clinicians have been working for decades to get it included in the DSM, but it continues to be excluded. It is, however, in the ICD-11.