Hi TQ - The stiffness of your machine will always be the limiting factor. If its a hobby, time and material removal rate (MRR) does not matter. But it is good to understand the physics of the process to get the best value from your bits. Its all a juggle to find your machines best DOC, chip thickness etc to achieve a good cut. Once you know these parameters you can stick to it. Then you can work on your machine stiffness if needed. I like 1F tools and your going down the right path. Keep learning... Peter

Regarding 0.046mm CL. I don't think it's bad advice, its just a number. The thicker the chip the better the MRR plus if the machine can do it the less chance of rubbing so you get the best tool life. Then there's tool sharpness to consider. A new tool will be able to have a larger cut. All of these factors:
tool run out, machine stiffness, tool stick out, tool sharpness, how many penguins you have, spindle power, machine accuracy, how the controller discretises the path etc end up affecting the cut.... the more you learn the better machinist you become.