Many of us state streamers most important because we hear great differences with streamer changes. Of course this assumes one already has highly resolving dac and system. The thing about dacs today is not all that difficult or expensive to achieve high resolution, transparency, the presentation or what some may call color is greatest variable these days. Even more digital sounding dacs can sound far more analog with streamers and network upgrades that minimize jitter.
I've been through five streamers and same number of dacs over the past few years, the streamers have more variable sound quality than dacs. Also, the top echelon streamers will really take one past digital sound plateau, one can achieve streaming SQ that approaches or competes with the best vinyl rig setups. I know this first hand from what I'm hearing today via my streaming vs the best of best vinyl rig setups I've heard over the years.
And my own vinyl setup is pretty nice even without having even heard recent $16K in upgrades. The problem is the streaming is so nice I can't stop listening to streams, I start off listening sessions with intention to fire up my old vinyl setup, but I'm so involved with the music I don't get around to it. I don't even have new cartridge mounted or phono stage connected, and this has gone on for over a month! I know, crazy!!
Streaming is the future, the future is now. As stated above in a post, streaming is now pretty mature technology, streaming can be one's best or only highest quality source, no need for media hardware any more. Not dismissing cd's or vinyl, just saying no need to go this route anymore.