Just because a bunch of people complain about one thing, doesn't mean it's correct.
Siege minions are a means to close out games.
This is a strategy game after all. If you couldn't figure a strategy before the enemies got to your inhib, then I guess you just deserved the siege minions flooding your base.
League can be complex, if you didn't want to be a loser and incompetent.
Even in normals this will apply, since everyone is playing the same game.
Surely there's a better work around to your issue, than just changing the entire system for turrets, inhibs, and siege minions l o l.
I don't like saying this, since I'm being serious, but maybe you should just get good and find a way to prevent that shit from happening lol.
I don't have a problem with siege minions. They're a little annoying, but since I let the enemy get there, I deserve that shit and I'll take it like a man.
They're not very hard to clear anyways, magic damage is effective vs them since they have negative MR.