If the portables are made correctly you should be able to use the portables on computers with the actual application installed without errors or registry entanglements.
If you cant tell any differance then its a good thing.
This means you are using your settings and not the installed versions config and any changes to the app's config are reflected in your config and not the system's installed version.
Some apps have very minor effects on a system and the wrappers address them.
7Zip in particular (even without file associations) cant be used on a library computer without depositing an ass load of registry entries.
Alot of the portables are based on older versions that did need the wrappers "containment" but have since been developed further
and no longer need the wrapper (other than to keep fans supplied with an updated version in the compliant PortableApp's format to use with their patented launcher menu that requires the package format)
such as Sumatra PDF reader.When they made the wrapper Sumatra couldnt save its settings in portable mode.
I personally envy anyone who can make NSIS portables correctly as it is the most challenging (& potentially dangerous) way to make a portables in my opinion.
As for the poll question;it depends on how the archived app affects the host system if at all.
I prefer apps that are portable without wthout any modifications or launchers needed.