In fact, SRP on admin account do much more. If SRP are off, then you have the normal admin account. If SRP are ON, then new executables are blocked by default, except when run with admin rights or added to the white list.
The downside of the above (for many users) is adding the new applications to the white list when they installed untypically (outside Program Files) or use the executable image to execute in the Temp folder (wrapped launchers).