Just recently I decided to pursue formal certification on Cisco equipment. Modern Cisco routers and switches support SSH but it has to be setup. Telnet is the default.
What really surprises me though is that the Cisco training community uses Telnet heavily. The instructors in online courses Telnet around even after they show how to setup SSH. The craziest thing I have seen is companies that rent "rack-time", which is network access to real Cisco gear, using Telnet as the access method. Not only are they promoting Telnet as a standard practice to up-and-coming Network Engineers, they are trusting their business to it.
Given that I have always insisted on SSH even when logging into my home server or internal-only web servers, I was pretty surprised to find Telnet used so pervasively.