Students who rely on that will never really learn.
From my perspective, most supposedly modern systems have been a bigger waste of time than some of the older ones.
Windoze, Linux, etc. in some ways still have not caught up to features that Multics and Plan 9, among other systems, had to offer decades ago - and they are bolting things on that came naturally to the older systems, so they don't work very well in contrast. They build complexity on complexity instead of leveraging a simple consistent approach that can actually be understood.
Multics was in some ways a conceptual precursor to today's "cloud computing" (in the sense that it was engineered to be a multi-tenant system with separate projects being billed for the resources they used), while also introducing the world to concepts such as access control lists (ACLs).
Plan 9 offers a level of network transparency and process
interoperability that most of our "modern" systems don't seem to
be able to get right, not to mention having been well-designed for
working transparently across systems with differing architectures
(SPARC, MIPS, etc.) out of a common file system.
If a student just wants to write business logic for some big
company doing batch processing or wants to create web sites or
some such then sure, let them stick with what is out there at the
moment. If they really want to understand computers and computer
programming, they should try to learn from the ground up. Being
limited to "modern" systems won't get them nearly as far as being
exposed to a range of ideas and different approaches that have
been taken over time.
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