I have seen so many posts about shots being out of focus. But If one can directly see the image produced by the sensor itself, that allows the best focus. Sometimes the AF picks the wrong thing to focus. Or won’t lock onto the desired object. Or maybe the light is too low. Or maybe a lens where AF doesn’t work or has errors. Yes, of course fast action shots don’t allow time for manual focus. I never suggested eliminating AF, but having easy MF based on the actual sensor image is a good option to have.

You are right in doubting that most cameras can go 400,000 clicks or more. The shutter stats at the link (I think further down on this thread) have FAR lower average shutter counts at failure than 400,000, except for the most high-end pro cameras. Most are under 100,000. A sort of bell-curve occurs for time to failure, as would be expected.

Just looked at the k5II (they didn't have data on the k5 they had a shutter failure at 97,000 but the data is pathetic
20 shutter counts total and just 1 failure. Its not necessarily even 20 different cameras. If they didn't have that 1 result what would the shutter life be infinite?

A lot of manufacturers give a shutter life of 100,000 at 10,000 a year thats 10 year life but thats just like the 60,000 mile warrantee car manufacturers give. There are not many cars that actually die at that kinda milage. It's just enough to give confidence it will last a while.