moving up 1 step for ampere rating is an acceptable practice.
Moving up in amperage with mains fuses, is unsafe.
Doing this is a very unsafe practice.
It will very likely burn out more than just the fuse.
EG: regulators, rectifiers, or maybe even the transformer.
+ whatever caused the fuse to blow in the first place.
The worst is it could start a fire, and take out your house.
they add nothing to the discussionThat’s because it’s snake oil and as the above states playing with mains components like this is a very unsafe practice, and very dangerous.
Cheers George