I can't find the earlier forum thread about this (and I've searched for it), but I remember that someone had proposed that there should be a more aggressive duplicate certificates limit with a 1-hour or 1-day reset, so that people would hit it much sooner when doing a wasteful reissuance (and hopefully thereby find out about the rate limits much sooner and with less overall frustration).
As I continue to notice the pattern of "I created my certificates inside a container/ephemeral VPS and deleted them over and over again, and now I'm rate limited" as a question on the forum lately, I would love to see a way to make people aware of this sooner and with slightly smaller consequences.
For example, perhaps there could be a 3 duplicate certificates per hour limit, 4 per day, and 5 per week, with the most restrictive relevant limit applying at any time. Then the people showing up on the forum asking about rate limits could more often be told "you'll need to save your certificates in persistent storage, and you'll have to wait an hour before trying again" rather than "you'll need to save your certificates in persistent storage, and you'll have to wait a week before trying again". They could then use that unexpected hour of downtime to research how to save their certificates in persistent storage.