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I think this is just a matter of progressive insight. Likely Sony found that the sensors attract slightly more dust when powered on, and perhaps found a very minor risk of damage due to shorting the contacts or power surge, and decided to add it to the manuals of later models just to be sure. -
Murphy law applies here. I have owned several point and shoot digital cameras since 2005 and none gave me this issue. I still use an "el-cheapo" Nikon Coolpix that is 10+ years old and sits in my desk drawer at the office because it is ready for use at any time, being powered by two AA batteries. Most of them died of "erectile" malfunction, i.e. the mechanism that pops up and retracts the lens each time the camera is turned on suddenly failed. The only camera that gave me the dust issue was the most expensive point and shoot one that I bought, i.e. the Canon G1X. Lesson learnt the hard way. -
I'm glad I haven't had that problem with my fixed lens digital cameras. The only good news is that they are less expensive to replace.
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