Why Is Synchronizing All-or-nothing?

Curiosity

Registered
Why is it that synchronizing bookmarks is all-or-nothing? All sites do not work equally well with all browsers or all devices. Bookmarklets certainly do not work equally well with different browsers with different rendering engines. It would be much more useful if one could specify exactly what to synch and what not to synch, but that is not possible. Would it be all that hard to make synch more flexible?
 
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