I am also convinced by the Rohloff hub and run several of them, dating from early 2000s until relatively recent, each w/o any issues. It is no doubt expensive but on the other hand I do not see any alternative that would deliver the same value in terms of gear range, low maintenance, usability and bomb-proofness. So a direct comparison is a bit pointless - what worth is it if a Shimano hub is cheaper but has a totally different set of features that do not fit my needs?
I do own a bike with a Nexus 8 premium and one with an Alfine 11 as well, so I can directly compare those hubs with the Rohloff and can clearly say that the Rohloff is lightyears ahead for my taste. Which is not important if you do not need the features of the Rohloff.
Regarding the statements of the OP there's in my eyes so much wrong that I would not even know where to start to criticize and there would probably be no ending as well, so I just don't go into detail and just state: full disagreement in almost every aspect.
One interesting thought experiment is if the Rohloff is overpriced. One can think about that but comparing it to any Shimano product would be plainly misleading for the simple reason that Shimano is a company with about 12.000 employees that is producing in Asia (including China) in huge numbers at low labor cost whereas Rohloff is a family run relatively small business with a little bit over 30 employees that produces in Germany in small numbers at high labor cost. The revenue of Shimano in 2019 will be about 360.000.000.000 Yen which equals about 3 billion Euros with roughly about 20% of that being operative profits according to Shimano's fact sheet (https://www.shimano.com/jp/img/pdf/fact ... 190630.pdf
) - that would make more or less about 600.000.000€ in profits. Rohloff on the other hand made about 450.000€ in operative profits in 2017 according to the German company house (https://www.unternehmensregister.de/
). I would assume that apart from the regional cost structure economics of scale do have a massive effect on the price of the final product as has the quality. Not even counting in that end-user-prices differ massively from OEM pricing and that again depends from the amount you buy.
Maybe, if Shimano produced the Rohloff hub in huge numbers, it could be 20, 30, or even 40% cheaper - just that they don't. And that there is no market for 100.000s of Rohloff hubs a year. Which makes this calculation a little bit pointless. The more as for mass production there is a probability that Shimano would cut corners qualitywise at some point to enable lower cost.