The basic difference between traditional watches and Apple watches, is that we know for a fact that we can hand down traditional watches for generations and hundreds of years, and they will still function and work as they always have.
Apple watches, we can expect any given model to be useful for 3 to 5 years. Until Apple abandons support for that model.
Granted, it may function as long as you stay with a cell phone that is compatible with that watch. Perhaps extending its life to a potential of 10 years for the most determined person who is resisting updated hardware / phones.
For that reason, traditional watches will remain desirable and useful as daily wear / fashion items, even if they were your great great great great grandfather's watch. That is something unlikely to ever happen with any model of Apple Watch.