Shane,
Well, this is a "light" backpacking website, and the philosophy is to par ounces. I am not saying everything posted on BPL is gospel or that it works for every situation.
Like you, I would not carry a single razor blade. An option to address some of your concerns would be a Derma-safe razor:

I have one, but no longer bring it on trips for some of the reasons you mention.
For years I have been carrying a Swiss Army Classic knife which weighs 0.7 ounces. Probably 90% of the time I use the scissors, not the blade. I also sometimes use the tweezers (although not the best tweezers I have ever used). I keep it on a red lanyard along with an emergency whistle and a Photon mini light. Pretty difficult to lose, and it is always at my finger tips.
I have never needed a larger knife. Would a larger knife be nice? Sure. So would a 3 lb mattress.
However, if you prefer a 3 oz knife, by all means take it. It doesn't make you less of a backpacker and the extra weight isn't going to overwhelm you.
Lastly, keep in mind a lot of people on BPL are passionate about certain pieces of equipment. Keep in mind that these are just personal preferences, not Gospel. And I will never go without toilet paper :)