I think all are agreed this was an "unusual" event and one that rightly has focussed attention.
VB started their gig with new aircraft and so have been entitled to claim a dream run by making that strategic decision and commitment.
Lets put aside the issue of walkarounds for the moment, other than to consider what may be acceptable for a new fleet may well not be acceptable as the fleet ages. That is pure risk management.
The issue for me as SLF is whether the aircraft have been correctly maintained AND whether their capacity to handle an ageing fleet is in place.
It does seem unusual that corrosion that can cause such an event wasnt picked up, but will leave that to the experts.