That is still an option, but there is a tradeoff. There is a button in the software to enable on-board memory mode.
You lose all your key assignment controls and fine-tuned DPI settings, but it stores on the device. If you want to have those features available, the mouse needs some software on the PC to talk to for more fine-grained control.
People have been saying this since he was forced into buying the platform. I initially thought that could be true too.
As time has gone on, however, I’m starting to think he’s just that incompetent