> > Apart from that, is there a good reason to use Recommend instead of Depend > ?
I'm not sure. wget and libcurl3-gnutls both "Recommend" rather than "Depend" on ca-certificates. I think it's because wget still mostly works without it, it's just TLS/SSL connections that fail. Node.js behaves the same way, all of Node.js works without ca-certificates except for TLS connections.