its just a reference beef.
A lot of people aren't as experienced as you say you are. I completely agree some people just over do it, lockout occurs and people start guessing. But I thought it was a great reference site. More updated with better pictures/descriptions.
Is cool dude, just putting the other opinion across, sometimes what we think as simple is not so and some seem to jump from thinking deficiency to overdose and from Nitrogen def to Zinc def, seems like its never as simple as we think. Trying to identify most plant problems from a chart is in itself problematic.
Most gardeners merely strive to get all the variables right and not to try and identify the problems. We live in a world where soil mixes and fertilizers are pretty cutting edge compared to many years ago, surely it is more the growers error as to when to add the ferts and right amounts rather than when they make a small mistake try and call it a single nutrient deficiency.
Get it wrong and you have ten times the problem, dont ask what is wrong with my plant, what deficiency is this because better problem solving would come from understanding how we caused this problem in the first place and their in would lie the solution.
Charts are good but not in my experience, you need a few years to actually use them charts, very few new growers can relate to them and the subsequent discussions are very humdrum and hit and miss. Dont bash me for straying from the norm but appreciate there are other ways to fix those problems.