It doesn't add much value to the conversation and whether some tech is really a rehash or not rarely matters. It also makes you sound cynical.
There's plenty of amazing innovation happening all the time, so I don't want to come across as a luddite or whatever, but hype does happen, and as you get older, you witness more of it and become more skeptical of it. You see the fads come and go--the faster they come, the faster they go--and the survivor bias. The problem is that it's there, and it feels sometimes like you face the choice of correctly pointing that out, or being labeled a cynic.
"I've seen people try that 5, 10, 15, 20, and 25 years ago. Nobody made it work." Is rarely something that does not matter, and people that can't answer the implicit "why would you succeed?" question usually doesn't.
Good, because my cynicism was hard-won, pity should it go to waste.
Whether or not a piece of tech is a rehash does matter, because last time we decided RDBMSs are old, in with the new open schema whatever, I learned where the sharp edges were at. There has been no magic tech in the mean time that makes MongoDB less likely to cut you up in horrible ways. As just one example.