I guess you have to think about it in a number of different ways.
As I explained in my first post, the way the rule used to be, to grab less than 4 fingers was illegal by application. That of course made it much easier to make such a call and most likely prevent injury, however at the same time it unfairly penalized wrestlers who although grabbing less than the required fingers also caused no injury to their opponent at the same time.
On the other hand, it is entirely possible to injure a wrestlers fingers even if all four fingers are grabbed as well.
In my 10+ years of officiating I can't say that I have ever seen a wrestler have a serious, long lasting, injury as a result of various different types of holds applied to their fingers even if they were bent illegally. Thats not to say it can't happen, but in my opinion, the likelihood of a match deciding illegal finger bending episode, which happened completely by accident, and caused no pain, suffering, or injury is far greater than allowing the official discretion in the matter as is currently the rule.
The easiest way to explain this like nearly every other rule we have in this sport is this ... There is the letter of the rule and then there is the spirit of the rule. The letter of the rule in all cases is to ensure fair competition and reduce potential injury. The spirit of the rule is knowing when and how to apply the rules in the best way possible. I can tell you that from my personal experience there is no greater frustration from an officials point of view than a coach who is well aware of a rule and simply seeks to exploit the letter of the rule. Some do so make sure their wrestler wins a match, rather than understand the spirit of the rule and let the experience of the official dictate that aspect.
Anyway I don't make a habit of posting on this forum as most are well aware, but I thought since I limit myself to 1 or 2 posts a year here this was well worth the time to respond and potentially shed light on a common topic. Feel free to message me if you have any other questions