I've accidentally stumbled upon the --no-compiler-signature directive that you can use to make your generated Delphi executable slightly smaller.
Add it to the "Additional options to pass to the compiler" in project options -> Building -> Delphi Compiler -> Compiling node, and not only can your generated file reduce a little bit in size, it can also remove the string "Embarcadero Delphi for Win64 compiler version" away from the generated file.
In 2017, with the release of Delphi 10.2 Tokyo, Embarcadero introduced a specialized implementation of the Observer pattern into the System.Classes unit. While it has been in the wild for 9 years, it remains a "hidden" architecture for many, primarily because it serves as the invisible engine behind LiveBindings. Other than live bindings, you can also use the Observer pattern as a way to update component settings to the Windows registry, an .ini file, or persist it elsewhere.
System.Classes