It's only a problem when you need to switch IPs urgently. Some browsers also maintain their own cache but it's not as aggressive as resolvers. Caching (e.g. ov

It's only a problem when you need to switch IPs urgently. Some browsers also maintain their own cache but it's not as aggressive as resolvers. Caching (e.g. overriding TTLs) cuts down RU on space, power, hardware, and latency (having to travel all the way down to the root NS for answers). There's definitely incentive in caching stuff.