It has a rocky start, and a lot of cruft from that era sticked around.
There are also a lot of horrible legacy projects from the pre-ES5 era which are a pain to work with. Often older projects were coded either before people knew how to do javascript right, or before the devs who wrote it knew how to write javascript right.
Ecosystems there won't necessarily fare all too well. Trees are drying up because they aren't used to that dryness/heat. New trees will take time to grow and they don't necessarily support the same species.
The mix of species you used to have that lived in a balanced way is being disturbed by various invasive species.
I'm not saying those ecosystems will necessarily collapse, but there is a nonzero risk that they might.
It has a rocky start, and a lot of cruft from that era sticked around.
There are also a lot of horrible legacy projects from the pre-ES5 era which are a pain to work with. Often older projects were coded either before people knew how to do javascript right, or before the devs who wrote it knew how to write javascript right.