The benefit of a manual gearbox is the driver is in control of how the engines power is used.
The driver can consciously decide when to use a lower gear for ‘better control’ when going downhill, in icy or wet conditions etc
A semi-automatic car includes this as an option, defaulting to auto mode and allowing the driver to force their own gear changes
I have a full manual car licence, and can drive automatics - I have to consciously remember when driving an automatic that it has a wide brake pedal and if I don’t remember then as I start driving I do an almost emergency stop at the first junction when my foot tries to press the clutch
I started on an automatic moped and changed to a manual motorbike after a few months, at that time I was taking a training scheme which was similar to the part 1 and 2 training now in use for motorbikes.
I had learned hill starts on the automatic, (stop - start) then struggled to relearn on manual (moving my feet for gear changes and needing one on the floor, but gear on one foot and rear brake on the other foot)
Though hill starts were simple in automatic,hill climbing wasn’t
For the local steep hill the automatic gearbox wanted to switch gear, it wanted to go up one but then couldn’t cope, and the lower gear was slow with a screaming engine
Learning the default manual (should) teach an understanding of gears with a good instructor, which can then contribute to understanding if an automatic is making the right choice and then you can compensate with a semi auto or adjust your accelerator pedal to guide the auto gearbox