I enjoyed looking back at my 20 year career through roles. I've done a few of them crossing domains twice. The tree should be seen as a constant evolving graph. There will be a plethora of new roles in the coming years.

For those who think Software Engineering roles are extinguishing, they just need to realize roles will evolve into something new. My current role (SRE) was a nascent niche at the start of my career and I didn't even know about it for many years.