[jurschreuder]

It's because updating dns does not work reliably so it's always a lot if trail and error which you can only see after the cache updates

[joelthelion]

Could you make your changes with a low TTL and switch to a longer one once you are satisfied with the results?

[throw20251220]

How does that help you if you have to wait for long ttl to expire before the short one takes over?

[nubinetwork]

You don't if you flush your cache... on linux, that usually means a reboot unless you run bind or dnsmasq and can just restart them.