Thanks! I think that mirrors my own thinking mostly, that the routine could be used to as a lead-in to more intense fingerboarding.
Personally I'd lean towards a few sessions of long bodyweight hangs in the grip types you want to train for a couple of weeks and then start moving the dial towards more weight and less hang time as this is established as an exceedingly effective method of gaining finger strength.
This part in particular very useful thanks. I didn't know more weight and less hang time was more effective than the opposite. Quick google shows a blog post from Lattice with a similar position (#3)
It makes sense when considered from the perspective that what we're trying to achieve in fingerboarding is to strengthen the grip position enough that it won't fail under the highest load we want to apply to it whilst climbing.
With this goal in mind high intensity hangs make the most sense as they will train the neuromuscular capacity to exert maximum force through a specific grip.
However it's worth pointing out that longer hangs or repeaters will likely have a better effect on forearm hypertrophy and short power endurance so the max hangs aren't the be-all-end-all, just a very useful tool in the box
Personally assuming I have access to a bouldering wall I prefer to use fingerboards primarily for the max-strength element and do my power endurance on the wall as I feel this has more general transfer to rock, but the exception would be for when I know I need to improve specific power endurance in a certain grip type i.e. 2 finger pocket in which case repeaters or long hangs can make for faster gains in that niche area.