They are not following the 5e rules though - in may places. Some issues are the fault of poor 5e design (esp around multiclassing) - but they could have followed rules around attunement and other aspects of the action economy which would limit character power - you should not be at max power and have most/all your resources before practically every fight. Getting crits should be hard. Resting should trigger random encounter which may force you to weigh up the wisdom of doing that. Even in regions where you can't fast travel, you have so much crap you are never really in danger and they provide ample things like potions that restore all your resources) - removing any challenge. Drinking potions should be an action, haste should not double actions, free shove attack etc - those implementation choices are not standard 5e and work against balance/action economy. There are others... to claim they are following 5e RAW is simply wrong. They were simply afraid of 'upsetting' certain people who don't like constraints and having to make difficult choices, so they dropped all of them. The simpler solution would have been a properly implmented 'core rules' setting - which many pushed for during EA.