I am still stuck on this as well. My group has a monk for the first time in more years than I can remember. We are early in the campaign so I can't make any serious calls on issues yet, but I'm well aware enough of the issues that do crop up around monk. My group have been playing for many years but never got into any level of optimization, rarely multi-class and still find enjoyment out of all the options in the PHB, so I am trying to keep this in mind when making any changes that scale power up. The only complaint the monk has had so far is that their play feels a little plain (this is someone who usually plays casters), and many of Fizbans fixes would remedy this. It is the AC that I am stuck on. I'm of the opinion that they probably need more, but not sold on how much. But I love much of the rest of his document and opinions so much that I am convinced he must be right about this too