If one takes the time to read all the relevant threads carefully then one would discover that it's noit the smuggling mechanic that is complained about, but the A.I. behaviour, scripted or otherwise, that accompanies said smuggling missions.
At the risk of repeating the contents of the numerous justifiable threads on the topic, the behavior complained about includes but is not limited to ninja scans, no FSD-cooldown, apparent God's-Eye vision, Interdictions on player from all-aspect and not only rear, immediate spawn-interdiction when exiting hyper-space, security vessel insta-spawn when exiting supercruise and so on and so on and so on and so on and some more. It could be fun if some thought was put into it. Atm it's shallow gameplay at best, only good for padding one's bank account at 50 million credits every hour or so.
So yeah, when complaining about 'smuggling' threads, take the time to dig a little deeper and we all will see that yes, smuggling is fine: The A.I. is however not, spoiling the entire smuggling dynamic/feeling: THAT is what is being complained about.
I've never experienced a "ninja scan" thus far, and I've completed quite a few Shadow Delivery missions. Interdictions can get a little annoying, since they're so difficult to evade, but that's the only real problem I've had thus far aside from not being speedy enough to evade the occasional police scan.