Where has SoftwareSerial gone?

Thank you for the recommendation.

So what happened to SoftSerial?

I can't find anything in the Release Notes, about SoftSerial being removed.

SoftSerial is listed in the libraries:

and it does not say it is obsolete/deprecated/dead/...

NewSoftSerial is listed on the libraries but not as a replacement, just an improvement.

How are folks supposed to figure this out?

Based on the libraries documentation, I'd expect to see it. I'll go raise this as a bug.