Eh, like I said below, I think this gets into "do I think I can write something that scales substantially better than Redis" / "was I at risk of generating load

Eh, like I said below, I think this gets into "do I think I can write something that scales substantially better than Redis" / "was I at risk of generating load that Redis couldn't handle" and I think the answer to both of those questions is no. But that's based on my skillset and the timeframe of the project; I'm not disputing that the project is bounded by Redis's performance.