Not true. Geekbench, especially single threaded benchmark, is probably the best we got, it has a bunch of workloads, unlike many other benchmarks like cinebench for example. And they publish all the results on their website, so you can dig into each individual workload and find the ones that apply to you.
And like the other poster mentioned, it correlates well with SPEC, so it's basically a easily accessible SPEC. These days the only benchmark I use to quickly judge some CPU is geekbench.
May I suggest the one I use (I wrote it), which also correlates well with SPEC & Geekbench 5, but also runs the benchmarks on all cores if you want to so you get both max single-thread and max multi-thread: https://github.com/dkechag/dkbench-docker . You basically run 'docker run -it --rm dkechag/dkbench'.
I took a look, it's not bad but it seems to contain too many micro benchmarks like regex or primes. Geekbench at least has clang which is a subscore that I always look at.
And like the other poster mentioned, it correlates well with SPEC, so it's basically a easily accessible SPEC. These days the only benchmark I use to quickly judge some CPU is geekbench.