Well an "average" tells you the average, which is usually not a lot, which is why other statistical indicators are used in addition all the time to properly understand a situation.
And making a product fit for its intended purpose (e.g. for the kenevo "strong guy riding 25% uphill in boost/shuttle+to throw it back down, repeat", see their videos then in doubt) is everything but "over engineering" it.
And what whatever company is going to do at least partly also depends on customer feedback which is why we are here.
Maybe you come down your high horse one day after maybee pushing back your broken 25Kg rig 20km uphill home through the outback to then wait two weeks to get it fixed. I already had my share of that by now.
Just because i am offering an alternate opinion and viewpoint, doesnt mean i am on a high horse. I dont see anywhere where i mention averages either, what i said without putting words in my mouth is, sales to % of failures for all manufacturers, its not about an average, a statiscal % of returns for failures, i would bet my left nut its pretty even across the board.
I agree customer feedback is important, but still and maybe sadly, a very small % overall, its hardly recall terrority, room for improvement, of course, but until you see it hitting sales figures its unlikely to change, however much that and an alternate view gets you bent of shape!
I enjoyed my Bosch Haibike and now enjoying my Brose spesh, both ridden throughout the year, i dont doubt the day i will have a failure, but not jumping on the brose is sh*t, till in my experience it proves to be that way, so no need to get more bent out of shape with a snippy reply, just giving some customer feedback, which is why we are all here as you say