@BenchLeaks recently spotted OpenCL benchmarks, running on what appear to be an Intel Arc Alchemist GPU with 512 Execution Units. Due to unusually low clockspeeds in the test runs, though, the Intel card struggled to best even the GeForce RTX 2060.
https://www.notebookcheck.net/Intel-Arc-Alchemist-struggles-to-best-the-GeForce-RTX-2060-in-leaked-Geekbench-OpenCL-benchmarks-but-poor-performance-is-likely-down-to-low-test-clockspeeds.580418.0.html
Or, it's because OpenCL is complicated, and "Geekbrains Monkey Corp" wouldn't have a clue as to how to write a good, PORTABLE kernel. :)