Perhaps the reason people question these complicated things is because they are, whether intentionally or not, being marketed to an audience on HN that includes small scale non-enterprise users.
I shall paraphrase others here: A problem does not exist for you simply because it exists for LARGE SCALE ENTERPRISE users.
What I would add to that is there is nothing particularly noteworthy about a large organisation's IT work simply because it is a large organisation or making billions in ad revenue, unless one is also working in a similar organisation. If some organisations are writing the next "Multics", it really should not be interesting to everyone. A single person who can do all the individual tasks you listed is likely to think critically when presented with "news" of organisations where no single individual can do those things. Its like how many Initech Corporation employees does it take to screw in a lightbulb.
I find some of the most interesting work is found in projects started by individual programmers working alone. luajit for example.