So many tests, yes. The game is actually designed, encounter wise, for a party of 6 using RAW 5e rules and stats. So, somewhere along the way, they decided 4 and nerfed it all and did some serious homebrew to try to make it work.
I'm fighting for both 6 party size and a RAW 5e default setting with options to tweak rules how you want.
So, example: Magic scrolls can only be used by appropriate classes is a setting by default. Option, player can set to everyone can use any scroll regardless of class.
Default= Drink potion as Action. Option = Potion = Bonus.
That sort of thing.
And monsters = standard stats with a few homebrew monsters with options to turn off monster resistance, etc.