That actually seems just as bad to me, since the URL often has enough data to figure out what was being pointed to even if the exact URL format of a site has changed or even if a site has gone offline. It might be like:
kmart dot com / product.aspx?SKU=12345678&search_term=Staplers or /products/swingline-red-stapler-1235467890
Those URLs would now be dead and kmart itself will soon be fully dead but someone can still understand what was being linked to.
Even if the URL is 404, it's still possibly useful information for someone looking at some old resource.
That actually seems just as bad to me, since the URL often has enough data to figure out what was being pointed to even if the exact URL format of a site has changed or even if a site has gone offline. It might be like:
kmart dot com / product.aspx?SKU=12345678&search_term=Staplers or /products/swingline-red-stapler-1235467890
Those URLs would now be dead and kmart itself will soon be fully dead but someone can still understand what was being linked to.
Even if the URL is 404, it's still possibly useful information for someone looking at some old resource.