I was reading Physiologic's Advanced Mechanic's Guide, which concludes that even with above 100% hit rate on the character sheet, the actual hit rate appears to be capped at about 85%. My question is, do we know whether we even need 100% hit rate to meet the 85% cap?

For example, is a character showing a 95% hit rate also capped at 85%? How about a character showing a 90% hit rate? If so, is there any reason to bring your hit rate to 100% (for PvE), or should we just make sure it's at 85% and then go for other stat eq?