Unfortunately a lot of mid-range tables nowadays don't have the strobe (mine included), most likely for aesthetic reasons... Even just looking at online shopping right now I only see a handful that do have it.

As for being skeptical, good! That means I'm doing something great according to Clarke's third law.

You can see me testing out the app on multiple records here: https://twitter.com/OKatBest/status/1795453042994680148

The results aren't 100% perfect, and they definitely won't be as good as matching specific frequencies, but it'll get you very close to the ideal RPM.