I think the question is not whether or not RNG is unfair - it's literally RNG and the numbers do not discriminate - but whether or not pure RNG translates into a fun digital gaming experience. When it comes to pen and paper you're sourcing enjoyment not just from the gameplay but from the whole shared experience with others. This may go lengths towards offsetting the disappointment / frustration with a case of bad rolls. However, when you're sitting in front of a PC on your own playing a game there's nothing really supplementing your experience other than progression, which is hindered by bad rolls and will just lead to a frustrating experience. This is why I think it's good that, as mentioned above, there will be an option to configure how this works.