Not really, TTLs are often short, but IPs might not change for years.
You can probably generate your own TTL, at scale, and avoid many DNS requests.
Or alternatively, if you don't tamper why would I want to use a service that serves stale data?
You can define away ‘stale’ by picking a consistency model, but look inside the consistency machinery and you will see fresher data you aren’t allowed to have yet.
https://www.rfc-editor.org/info/rfc8767/
As a corollary, there is obviously no floor on refetching unexpired RRs, of course, except for efficiency concerns.
At least in my country (UK) I know of no law relating to DNS caching.
Why throwaway perfectly good data every few minutes that is only modified every couple of years, just so someone can move their domain quickly when they eventually wish to? It is my contention that a [caching] DNS service can do far better. Trusting user (domain owner) input blindly is not for me.
I should be a bit clearer here; the TTL is an upper bound on how long it can be cached. Caches are free to consult more frequently but not less frequently. That said, out of respect for upstream cache operators and authoritative servers, most DNS caches honor TTLs as best they can.
Advocating to do things against agreed-upon standards without a compelling reason and without giving due consideration to the adverse consequences is one of the hallmarks of a bad engineer. Even Microsoft played nice with Internet standards for the most part (although with some notable exceptions at the application layer that got them well-deserved criticism).