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Originally Posted by
DanK
I assumed you meant focus stacking. I assume Andre did too.
Exposure stacking is a good way of removing noise, if you need to. As far as I know, it has no impact on either color or softness. It is simply a way of averaging pixels that are the same place, which is what removes the noise. It takes advantage of the fact that much of the noise is random, appearing in different locations in different ones of the images you blend. Median blending in photoshop is much the same principle: something that shows up in only one or two of a series of photos won't be the median pixel value and isn't included in the composite.
This doesn't affect color, and if the camera isn't moved between shots, it should not lessen sharpness (or increase softness). Note that the article you linked mentions neither improving color or generating softness.
If you use really long exposures, far longer than you used, you can get what are essentially hot pixels. AFAIK, exposure blending won't help with that, despite what the linked article says, because it has no impact on noise that is in the same location in each shot. That can be taken care of by what is called, at least in the Canon world, long-exposure noise reduction, which takes a black frame of the same length and, since the bad pixels appear in the same place, subtracts those from the original issue. You wouldn't need this for exposures of the length you had here.