Do expensive safety razors last a lifetime?

Many are marketed as buy-it-for-life, but the reality in community reports is mixed. Some r/wicked_edge users report a Merkur 34C handle thread stripping within months to a year, and a long-time Bambaw owner noted the handle thread eroding after years of use. Heavier all-metal builds and simple three-piece designs tend to draw the most durability praise.