"Guessing as a skill" also makes it a big barrier of entry for people who are bad at it. That doesn't really even the playing field for people new to the game or who are terrible at guessing ranges.
This is true of literally every determining factor between players of different skill levels. That's a design goal, not a fault of a system. Reward the better player with better results. An even playing field should refer to two players of equal skill having equal opportunities, without squandering the design of a game rewarding a better player with substantially higher chances of winning.
Any other use of the terms "level the playing field" would have to refer to introducing more randomness to the game so that a newcomer doesn't get lit up by someone who knows what they're doing. This means you're (albeit slowly) eliminating the element of player skill being relevant, as the more you tweak your product to cater to a new guy vs veteran scenario the less the game is actually functional for two players of equal skill.