I'm gradually getting into org-mode. It has yet to revolutionise my life, but it's handy for taking notes with inline code.
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One day I am going to reach the height of technological sophistication, and every clock in my house will handle daylight savings automatically.
I'm not there yet. I think modern appliances are getting better though.
(Does a microwave really need to know the current time?)
Over a sufficiently long time horizon, all code you write is legacy code.
TIL Tcl has a notion of 'safe interpreters', a mode where you can run untrusted code in a sandbox: https://www.tcl.tk/man/tcl8.4/TclCmd/safe.htm
Not many programming languages have this, but it's way safer to include in the implementation than try to build as a userland library.