I have Razer Synapse installed right now, I am not logged into the service but I am still able to make configurations. Don't know what issue you're having. I would feel the same way if this was an issue though
It was: https://www.tomshardware.com/news/razer-synapse-3-removes-lo...
It would be great if they used the additional on board macro profiles as an 'out of the box' way of adjusting the mouse without software. You nerd the software to change mouse button 4/5 to native actions, otherwise it's just dpi control.