Sheet metal flashings- a critical choice for decks

Did you know galvanized sheet metal flashings should not be considered corrosion resistant for the life of the deck system?

Saw this great article at this link http://www.intres.com/inpage/pub/deck_design_guide.pdf on plaza deck design...

If you build waterproof decks, waterproof decks or want a leak free deck...read it. 

For HOA's with reserve studies, how does the sheet metal life effect your reserve study knowing the metal won't last the life of the system?