because they have never done it before, or to a very limited degree. why would you assume anyone knows how to ssh from a terminal? that's a very specific skillset. nobody is learning that at school.
using linux/unix has nothing to do with computer science especially today, vs 20 years ago.
maybe you use ssh daily your entire life, but that's not how other people do things. my research org has moved off linux/unix platforms to the point that our researchers only use ssh for legacy/archival projects. nobody is using it for anything after 2014. yeah, 10-20 years ago it was a ssh was a daily necessity, now it's like once a month or less.
all of our new stuff is web based. you login to a website and you access resources through the web, that way everyone can work remote and the infrastructure for those at home and in office and across the country, is unified and simplified and easy to access.