Foffa Bikes

Possibly, by sufficient observation of physiological markers, one could determine that subject A responds more positively to an SLR rather than an Arione, and that subject B responds more positively to an Arione rather than an SLR. Or you could just ask them. That still makes saddle comfort a subjective matter.

One might even be able to take measurements of the pelvic area and other material characteristics of the cyclist and predict with unerring accuracy which of the two saddles they would find more comfortable, but it would still be subjective, i.e. you would get different results for different subjects.

However if you took that data to manufacture a new saddle devoid of any live testing you would objectively be manufacturing something that you knew to be comfortable for a majority. Not everyone would find it comfortable, granted. Although there would be a majority that would based on measurement and objective, quantifiable data, that had been gathered in a scientific manner.

I don't believe things are as black or white as you're making out. Certainly not by dictionary definition. A great scientific diagram of 'cross-over' the Venn diagram is a visual representation of exactly this. Certainly when it comes to things like probability - the 'belief' that something will or has occurred.