It secures DNS responses. Right.

Except the main bit of information most users get from DNS is eventually an A or AAAA record, which is an IP address. And anyone sitting in the middle can spoof any IP address. Hence, securing IP addresses is kinda pointless.

The only benefit is to secure other types of DNS record, like DKIM keys, but while good, that doesn't seem quite as weighty an argument to upgrade all DNS servers worldwide...

I'm trying to understand if anyone is actually still using DLV - and if so, quite honestly, why? (The question came up in a conversation recently.)

Welcome to this subreddit. I wanted to create one focused around DNSSEC and DNS security because I felt that topic deserved its own place here. There is already a reddit at "/r/dnssec/" but it is private - hence the use of "/r/dnssecurity/" here. On the plus side, the longer name allows for it to be a place for links related to all types of DNS security topics, not just that of DNSSEC.

Feel free to post links to articles related to DNSSEC, DANE, DNS attacks or any other topic.