“Trademark” it may be, but “meaningless” it is not. If you try to fiddle with registry-settings in non-installer programs, you might well find your program swatted-dead by some “anti-virus” bit-cop somewhere. Here, for instance, if you run such a program ... the program dies, you get logged-off and the corp. security department has to be called to unlock your workstation.
If, when an installer is run, it has the appropriate authority--by virtue of the account it is being run under--to make the changes required, then running a perl program under that same authority, will have those same permissions.
On the other hand, if the "anti-virus bit-cop" would detect the perl program as unauthorised, then it would also detect an "installer program" as equally unauthorised.
There is nothing magic about installer programs; they are simply code calling APIs.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.