"IXY" I understand where yr comin' & agree with you from but that single word used the world over "WHY" in all languages will always perplex mankind :-)
Why indeed do we do anything from cleaning our teeth to checking the the fuel in our tanks, why we do it is to keep the species alive & maintain some semblance of order & longevity.
It's a bit like insurance, why have it?................. 'Just in case' Doesn't guarantee anything.
Why carry a spare wheel? 'Just in case' Doesn't guarantee anything.
Why do we have a BFR/AFR? "Just in case' Doesn't guarantee anything.
If we didn't 'WHY" then there would be more 'WHY's":-)
Long live the Aeroplane
Wmk2