Frank Denis worked for years for OpenDNS, one of the largest recursive DNS services on the Internet. While there he developed DNSCrypt, which has many users and was instrumental in pushing for encrypted DNS. And looking through his github, he has other DNS tools as well. DNS is a contentious issue and I don't agree with anyone on everything they say about the subject, but I agree with Frank here on the waste of absurdly low TTLs and in any case it's wrong to think he is inexperienced.

I'm not sure that's right. By virtue of how caching works, it's significantly less of an issue for very large services which will have absurdly high cache hit ratios all the way out to the edge within the 2.5-5 minute windows just by sheer user volume per 2.5-5 minute window.

It's everyone below that that don't operate very large scale services that will see the benefits from longer TTLs.

Your comment would be a lot stronger if you could tell us what those reasons might be