If you don't need interaction, why do you care if the install scripts run some time later via SMF or what have you? Because implementing and debugging the asyn

If you don't need interaction, why do you care if the install scripts run some time later via SMF or what have you? Because implementing and debugging the asynchronous execution of postinstall scripts is extremely difficult, and preinstall / preremove / postremove nigh impossible. IPS was an extremely bad idea by people who have never done large scale configuration management with OS packaging.