I said nothing about ignoring anything. I said that there's a section in the DMG that explicitly says that one option is to never roll the dice for out of combat encounters. Whether it's a good idea to do this is up to the group.
It's your preference that there's always a dice role, the DMG clearly contradicts that there must be a dice roll.
And I stated what the DMG says the drawbacks of ignoring the dice: Favoritism and Imbalance.
So what I am saying to those who say the DM can or should ignore the fighter's mechanical deficiencies in ability score force and ability modifier roll in order to reinforce: their game are very likely unbalanced.
It might be fine for them, but like for many things, it is probably not a good general idea. 5e was designed around ability scores and ability rolls. Removing them is likely only for tilted tables or experienced DMs.