I totally agree with you. When removing the glass, you risk breaking a rubber seal which will allow dust to penetrate. If you get that combo of digitizer+glass and all the frames in one, you get new home buttons, flex cables, speaker and sensor as well. I am going for that one as I feel this step is too laborious.

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I have been repairing iPhones now for 2 years. This procedure is a waste of time and money, spend the extra 15 bucks and get the glass with the digitizer, you don't have to spend 3 hours to replace your broken glass because you spent 2 of them separating glass from glass. by the way, good luck getting the new glass on with out a scratch or piece of lint/dust in between.