Geekbench does use many libraries that are used in both commercial and open source applications.
For compression, LZ4/ZSTD: Mostly used in Linux?
Navigation: How many self learned developers who mostly learned by shooting their foot off and learning to the extent of what NOT to do to compile software successfully, know about Dijkstra's algorithm? I bet most non-CS background programmers think the problem is easy to solve and just use brute force to generate such routes.
HTML5 browser: Why doesn't GB just use a full open source browser for this workload instead of trying to mimic one?
PDF Render: Again, it's using only the PDF component in isolation and not simulating how a browser with other tabs open would generate a workload or how a browser would first launch, load its engine into RAM and then display the PDF.
Photo Library: Mimicry instead of using real downloadable software for such user tasks.
Clang: This is a more real world workload but is it testing compilation only or JIT compilation too? Not clear if it's doing both. Is it running some workload in Lua after compiling it?
Text processing: What kind of convoluted mess is this? Why is there an encrypted in-memory file system being used? Which real text processing software does this? And using Python that can never achieve true parallelism due to its GIL issue? How many normal non-developer folks use Python for multicore workloads in their daily lives?
Asset compression: This is a workload that is even more limited in scope as it targets a specific species of developer: the Game Developer, renowned for the ability to CRUNCH, CRUNCH, CRUNCH with minimum sleep and maximum caffeine. What is this workload going to tell the average user?
Object Detection: Why not use a real open source software for this purpose?
Background Blur: Not a bad workload but only 10 frames? How can those 10 frames capture the rapid head movement of a typical user on cam?
Object Remover: Again, why not use Gimp?
Horizon Detection: Why no Gimp?
Photo filter: Doesn't mention a library so maybe written from scratch?
HDR: This is also not using a library and written from scratch meaning it may not be reflective of HDR operations done in real applications.
Raytracer: No issues with this since it's using Embree.
Structure from Motion: No mention of library. Custom code.
And the remaining tests don't mention any libraries either.
This benchmark is mostly a mishmash of custom code with the occasional widely used library. How can it possibly reflect real world usage?
I pray that your much-awaited eekBench does not suffer from the above mentioned pitfalls.