domain name system - DNS hosting design - should secondary server not be spread over countries, networks etc?

My DNS registrar and DNS provider recently had a long
outage, rendering all my domains unusable (email, own+client websites
etc).

They have 3 DNS server, who are all in the
same co-hosting facility!

I know just enough
about networking to make my spidey-sense supertingle, but not enough to condemn this. Is
that not an atrocious design?

Should they not
have been spread across lines, networks - even
continents?

href="https://i.stack.imgur.com/nPQaw.png" rel="nofollow noreferrer"> src="https://i.stack.imgur.com/nPQaw.png" alt="enter image description
here">

(Source: href="https://help.hover.com/hc/en-us/community/posts/115007805527-After-recent-outage-what-are-you-going-to-do-to-fix-your-network-design-problems-"
rel="nofollow
noreferrer">https://help.hover.com/hc/en-us/community/posts/115007805527-After-recent-outage-what-are-you-going-to-do-to-fix-your-network-design-problems-)

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