Is allot of networking outdated?

So I finished uni last year and realised over the course that allot of networking best practices seem outdated.

For example allot of reasons for redundancy seem outdated, and the scenarios that they are applied to seem unrealistic in some sense. For example a medium business with 3 buildings with say 10 departments in each should have a dedicated server per department, and the 3 buildings should be linked in a mesh topology so that there is redundancy.

No, just put the first server in building 1 and the 2nd in building 2 and have a link between, all departments have separate VM's on the server. Wipes out $50,000+ easily. With virtualisation most companies can get by on a decent server, forget having wall to wall servers to drool over.

Also users,making sure your antivirus is up to date, and stuff like that, dodgy sites will be blocked at hardware firewall level and you don't have to update anything as sysadmins do all the work for you, and even that is not entirely true as a script will probably just run on a server daily/weekly, sysadmins may not do a thing.

You get the idea, so much of the stuff taught seems either pointless to a degree, in the sense that 1 week of real work any user in any job will realise sysadmins do everything.

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Thinking that PC's crashing is often a thing, no its not the 90's, with windows 7/10 they practically don't die, it's come a long way from the days of 95/98/XP. Learning about bus and token ring topology's, as well as star & mesh obviously, why bother learning any of the old bus & T-ring shit, I 100% believe you will never encounter this ever it's nearly 2020 FFS. On the same train of mind i think even 90 y/olds know to "turn it off and on again".

A slight deviation from topic: I have saved the best till last. Thinking you will walk into a supercomputer type data-centre, Like FUCK NO MATE, it's 10 y/o equipment in a half full rack in some closet, not everywhere is MS/ Facebook. Hell even our uni had 4 r710's stacked on 2X4 wood on a table, and that was supplying the whole computing department, and I think the department on the floor below.

If it's not outdated it seems misguided, what do you think?