"A common mistake most DMs make is to rely too much on random die rolls. An entire evening can be spoiled if an unplanned wilderness encounter on the way to the dungeon goes badly for the party. The DM must use good judgment in addition to random tables. Encounters should be scaled to the strength of the party and should be in harmony with the theme of the adventure." (Emphasis mine.)
Okay, I am guilty as charged. I love die rolls and randomness. Not simply for randomness' sake but instead for the creative muse they provide. Trying to figure out why there are ghouls in the elven forest is part of the fun.
I also found the emphasized portion of the quote interesting. My impression is that one of the cornerstones of the OSR is that encounters should not be scaled to the strength of the party. I also rarely worry about scaling encounter difficulty relative to party strength.
However, I do try to scale difficulty relative to depth (for dungeons) or distance (for wilderness). That way players can make logical decisions and their actions have meaningful effects.