It's all metrics and numbers.
Bingo!
Scriptural requirements are "moderate, hospitable, reasonable", etc.
Well how do you measure, for example, "moderation"?
Brother X says "Joe Witness, yes he's moderate."
Brother Y says "Joe Witness, no he's not moderate".
Who's right? Who knows? It's all subjective. Some elders know Joe Witness better than others. Some elders don't know him at all. Brother X says he's moderate, but Brother X has some really weird ideas, so maybe he's not moderate? Brother Y says he's not moderate, but Brother Y sometimes exaggerates, so maybe he's doing it again now. Who knows?
It gets all bogged down in opinion, perspective, history, personalities....
Oh, but hey, field service numbers? What's their monthly average in field service? 10 is bigger than 4 so the brother with 10 must be "more spiritual" than the brother with 4. Let's appoint the brother who must be "more spiritual", otherwise I'll be trapped in this stuffy smelly room with old sweaty men for another 3 hours.