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When you have an unreliable ISP it helps to have something easy to ping and run traceroute on.

Lots of folks end up with a few memorized, very-useful internal and external IP addresses, if they work on networks or datacenters much.

They can do that with IPv6 too. https://news.ycombinator.com/item?id=26615231 (the last paragraph in particular).

My home LAN DNS resolver: 10.10.10.1

The external DNS I use now: 8.8.8.8 8.8.4.4

My alma mater's DNS servers: 18.70.0.160 18.71.0.151 18.72.0.3

DNS servers for work: [redacted]

I've had to manually configure DNS about 5 billion times, these numbers just roll off the tip of my tongue. I work with lots of embedded devices, manual configuration is often necessary.

People don't use 1.1.1.1 1.0.0.1 (cloudflare) for external dns? It also resolves http/s requests, so it's usually my go to external endpoint for testing and troubleshooting. google.com is still my go to for domain resolution troubleshooting.