Baseball’s arbitration process isn’t fun. Players are looking to make up for being woefully underpaid (relative to the amount of money in the game) during their careers up to that point -- including both their time in the minor leagues and the majors -- while teams are looking to pinch every penny possible.
A lot of times, that can lead to some hurt feelings based on disagreements of value -- we all want to be fairly compensated and valued, right? -- especially when those disagreements are taken to an arbitration hearing. That’s why teams and players both try to generally avoid them.