VirtualRain
macrumors 603
Good optics is what matters, and as of today SLRs (analog and digital) outperform the micro four thirds cameras.
Honestly, it sounds you have little experience shooting. Through the viewfinder you get better composition, and better focus since your eye receives the proper amount of light. Your histograms will be good and will confirm your use of the viewfinder.
With out a viewfinder is like reading on an iPad under direct sun light at the beach. Not to mention during a concert or while metering light on night photography.
You're right, the viewfinder can provide a more accurate view in some situations, but it fails in low light, long shutter exposures, etc. It's got just as many flaws as looking at a screen. And a screen can be a lot more convenient for getting a desired composition than putting your eye up to the viewfinder in perhaps every situation except direct sunlight. Exposure simulation is possible on a screen... not in a viewfinder.
But anyway, I think we agree, it's not the screen or viewfinder that separates these cameras... it's the quality of the images they produce.