As far as we can tell, there aren’t any major downsides to this. Addresses will be saved with their timestamps as they are into the recipient’s AddrMan. However, the concern here is that—just like the other solutions we’ve considered (setting getaddr responses to now()/current time or to 0)—the timestamps will either be saved as-is, adjusted to 5 days ago, or set to the current time. One possible issue is a synchronized pattern where batches of addresses are marked as ‘Terrible’ at the same time and are therefore at risk of being filtered out simultaneously.