billd91
Not your screen monkey (he/him)
Like I said, you've crafted a fairly niche situation (non-hostile hill giant against an enchanter specialist that are met alone so that their buddies don't attack, and you win an opposed Charisma check as a Wizard [no retries] to allow you to do something that I think is against the rules [fight its allies for you]). If we change it around to other niche situations (like fighting that flesh golem or that skeletal cloud giant), then your character looks way worse off.
I don't think I'd call ordering the hill giant to fight his own allies for you against the rules. I have no doubt they'd do so just fine - a better question would be which allies? If a wizard were charming a hill giant at the steading of the hill giant chief, I have no trouble seeing a single charmed giant being OK with fighting the clan's juveniles, any other single giant, bunches of orc slaves, or the dire wolves out back in the yard. But taking on the stone giants, the cloud giant, or chief Nosnra himself? Probably not. Not unless he recognized he had an obvious advantage on terms he understood - and I'm not sure having a wizard trusted friend and ally really fits that bill.
You can argue balance problems, but your point was that preparing save or die spells wasn't particularly risky. I'm pointing out that even inside of your niche situation, it's still pretty risky, and it's not nearly as powerful as you make it out to be (I even quoted Charm rules for you... it may not even see your allies as okay). And, of course, outside of your niche situation, the save or die spell, the feats, etc. are a waste for that encounter.
So, I'll say it again (even though I just did), you can argue balance problems, but it's probably best not to argue that save or dies aren't risky and then throw out a niche situation (that seems to favor this Wizard very well). It's just not accurate.
This sort of thing often seems to come up in these wizard = autowin or quadratic wizard, linear fighter debates. Optimal conditions, friendly interpretation of spells and abilities, optimal equipment. Quite often the sorts of things that don't actually show up in games or, when they do, it's because someone is taking advantage of the GM's misconceptions. Sometimes it's not deliberate considering the complexity of some of the rules and the assumptions that people have imprinted on them over the years, but sometimes, particularly when you start to hear really tortured interpretations, it clearly is.