To put it another way, <blink> has meaning by virtue of its history. Its presence on a page says something to the viewer - not something technical but something cultural.
<blink>'s removal does not make the web richer or more meaningful. Instead, its removal does something quite the opposite.
I won't say that it is vandalism - but it does wantonly alter the expression of existing web content, and does so to the very content that is most in danger of being lost to history. It neuters what makes some web pages representative of their time and place.