JoeV
Thin Air, Bright Sun
Well, this all comes into play no matter what size your photo is... sure if you only make 3x5" prints... maybe not. However, something that needs to be stated is that more megapixels actually helps in this department. IF you have a 50mp sensor and are only making 6x9" prints... you are only printing at a small percentage of its native output size. This will mask many mistakes. The problem is that it is fashionable to look at everything at 100% on your screen. This will show every issue. It seems that 50-90 years ago, out of focus photos, camera shake, etc. were acceptable. I think these looked better in film... and of course the cameras were harder to use and the film was a lot slower. Now, with digital, it is completely unacceptable and we've gone the completely opposite direction. People expect every little thing to be perfect... even into the realms of fantasy.
Another thing, the smaller the sensor, the more that is in focus. Depth of field gets shallower with larger sensors making critical focus more and more important.
All in all, if you want to make big prints with perfect detail... you need good technique and a decent lens. This has always been the case. It's just that these days, there aren't too many really bad lenses being made by the major manufacturers.
The trend toward more film-like images should be smaller and smaller monitors!