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Thankfully the impact of this is limited in modern browsers as the cache is partitioned by site.

Which, incidentally, also removes the last fringe benefit of those free "JavaScript CDN" services. They are a strict net-negative now.

Though small, isn't convenience a benefit? I think a lot of new developers especially find it marginally easier to copy a script-tag.

For a small test or personal site it's fine, but otherwise you're trading developer convenience for a longer load time for every user.