How would a binary decision making based on player data work? If it was with decision trees - ie at each stage if the player passes the yes / no for fulfilling a certain criteria - then the parameters would still be decided by someone. You have to trust the person carrying out the analysis and their abilities to make fair reflections.
Also I believe football data analysts do indeed assess players against others playing in the same position across the league - see a nice example from twitter here
https://twitter.com/HenshawAnalysis/status/1394936830886285313. I think the tools like Wyscout probably provide them as part of the package. Whilst we don't seem to have a full-time recruitment data person I'd be interested to know if the club had a paid subscription to something like Wyscout - questions would surely need asking if not!
A binary decision would be where the statistcal analysis shows one player is better than the other eg. for a striker shots at goal/shots on target percentage. I suppose you could argue that even that has a certain amount of subjectivity because some shots are easier than others.