[d4mi3n]

This is highly dependent on your environment. I work in finance and there is legislation saying we must encrypt all traffic on the wire.

Legislation aside, this also goes back to a defense-in-depth strategy; TLS proxying only works if the network behind the proxy will always be secure. You might be able to get away with running TLS on the same host as redis, but in all other cases I can think of you're going back to the 90's-era security policy of having a hard shell and a soft underbelly--anything that gets into the network behind your TLS proxy can sniff whatever traffic it wants.

EDIT: It occurs to me that you seem to be hinting at running redis as a public service. In that scenario it makes perfect sense to use a TLS proxy for versions of redis without SSL. That said, it's still important to encrypt things on your private network to ensure you aren't one breach away from having your whole stack blown open.