I don't think overuses should be a reasonable cause for defects within 2 years. If 99.9% of users use it less than X, then covering the last 0.1% is not a significant issue.

The top 5% on the other hand are IMO within normal usage patterns.

The exceptions seem to focus on using consumer products like a coffee maker in an industrial setting. But, 2 years is rather short term to be replacing these devices not to mention the overhead of a regular breakdown > replacement process.

Yes, I think it does. I find it a reasonable balance between weeding out early failures and not letting customers get away with abusing their devices and still claiming a warranty repair.

How can a user prove they didn't misuse an item, though?

That would depend on the specific item, I'm sure. For example you can tell if a phone has ever been wet because there will be signs on the interior. No situation will be perfect but at some point the burden of proof has to shift from the company to the user. I think six months is probably a bit soon but sometime between that and two years seems reasonable to me.

Six months, not two years. I personally tend to ignore warranty periods of under a year anyways, since products with such short warranty periods (30-90 days is common here in the US) tend to be cheaper to replace than to get warranty service on anyways.

On the other hand, warranty here in the US can be annoying to deal with anyways--I've failed twice at getting replacements for Samsung flash memory cards that have been in production for less than their warranty period. There a some problems (microsd becoming read-only) that can't be caused by user misuse. That might be more reflective of Samsung as a company, however I've had similar issues with other companies as well.