Tegmark has a vivid metaphorical name for these subjective ingredients. He calls them "baggage": the word connoting the burden or error in our description of nature due to the biases from our biological, cultural or individual history. He has an even more vivid metaphor for the effort to strip out such subjective ingredients from our description of nature: the effort which science, especially physics, has historically made, and should continue to make, so as to overcome the biases. Thus he calls getting rid of the subjective ingredients "reducing the baggage allowance". (In an age when we are ruining the planet with too much jet travel, this seems a worthy aim.)