Exercise 3: Why "Windows PowerShell" and "PowerShell 7" Aren't Just Version Numbers — Possible Solution
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WHAT THE ASSUMPTION "JUST A VERSION NUMBER" WOULD MEAN
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If Windows PowerShell 5.1 and PowerShell 7 were simply older and newer
releases of the same product, a script behaving differently on two
machines would most likely just mean one machine hadn't been updated
yet - a straightforward "update it and the difference goes away"
diagnosis.

WHY THIS CHAPTER SAYS THAT'S NOT ACCURATE
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Per this chapter, "Windows PowerShell 5.1 ships built into Windows
itself, while PowerShell 7+ is a separate, cross-platform, open-source
install - Windows Terminal defaults to 5.1 unless 7 has been explicitly
installed and set as the default profile." These are described as
genuinely separate products with separate installation paths, not
sequential versions of one thing - a machine can have 5.1 alone,
both installed side by side, or 7 set as the terminal default, with no
guarantee any two machines share the same setup.

WHY THIS MATTERS FOR TROUBLESHOOTING A SCRIPT DIFFERENCE
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A script behaving differently on two machines might not indicate a bug,
an outdated machine, or a configuration mistake at all - it might
simply mean one machine is running Windows PowerShell 5.1 by default
while the other has PowerShell 7 explicitly installed and set as
default, and the script relies on a feature or behavior that differs
between the two. Assuming "just update PowerShell" as the fix, the way
one might for an ordinary version difference, could send troubleshooting
in the wrong direction entirely - the real question is which product is
actually running on each machine, not which version.

WHY CHECKING WHICH ONE IS ACTUALLY RUNNING MATTERS FIRST
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Confirming which of the two is genuinely active on each machine -
rather than assuming based on age or update history - is the first
real diagnostic step, since (per this chapter) the terminal's own
default doesn't automatically reflect whichever one was more recently
installed.

WHY THIS WORKS AS AN ANSWER
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It states the flawed "just a version difference" assumption directly,
cites this chapter's own explanation that the two are separate products
with independent installation paths, and explains why that distinction
changes the correct troubleshooting approach rather than treating it as
a minor technicality.