You'd be surprised how much old technology still hangs on. Industrial and manufacturing sectors are some of the biggest hold outs. When it can cost a company majour production downtime on top of the cost of upgrades, it's easy to see why old tech is still used.
A good example is one of the cranes I maintain uses thinnet and BNC connectors for parts of its network segments for its wireless system. This crane is only 7 years old, but due to the wide variation in temperature and motion of the cabling thinnet was just the better choice. Many of the old standards are still the norm rather than the exception (don't get me started on serial and RS-422). Ever heard of DH+ data highways? Yeah, I support it.
While working in a consumer tech shop this stuff can be forgotten, but believe me, it's still out there.
That's a good example of "if it ain't broke, don't fix it", I love it.
As for OP, The old tech is included because you need to understand it to understand the newer tech. Like learning history in school, can you exist without it - yes, but those who forget it are doomed to repeat it. You need to know where you come from, to understand how the newer technologies work because newer technologies are all built on older technologies. Take subnetting for example, you have to add all the ones and zeros because without it, you have a huge waste of IP addresses. Regardless of using newer cabling, or IPV6 the concept remains the same, subnets are subnets, and if you don't understand how it's used to logically
group computers on the same physical
network, you're missing a significant concept of modern networking.
On the other hand you have
to learn the older tech because
it's on the objectives. regardless of the fact that nobody in town here seems to be able to afford signal lights on their cars, they still needed to learn to use them for their driver's licence. They may not use them, but they still exist