None of the many bad ideas in boat building showed up till the boat was in the 20+ year old range
1. Teak Decks screwed into the core EVEN Swan did this at a massive cost to whoever got stuck with the boat late in its life
2. Plywood core decks again a good 25 years till the real issues show up
3.. Gaskets on Pearson stanchions
4.Steel on frames on the many different Cals that used it
5. I have seen badly rusted Steel steering parts on 10 year old Beneteaus