It is! ComputeSharp doesn't copy buffers automatically, and this is done on purpose to give you more control over when exactly to copy your data back and forth. You can either use normal resource types (eg. ReadWriteBuffer<T>) and manually copy data to/from them before and after running a kernel on the GPU, or you can also create some transfer buffers (eg. UploadBuffer<T> and ReadBackBuffer<T>) and use them to have more fine-grained control over all copy operations and also the allocations of temporary GPU buffers to control copies.

I'm currently writing some updated docs to go over all these details, since the ones currently on GitHub only refer to the previous v1 release of the library.