not really true, you can get a good idea what the plant is dealing with just looking at it if you know what you are looking for, the problem comes when one indicator has 3 or 4 possible reasons for it to look like that, Sure it helps to have as much info as possible but every node tells you a story. I personally didn't ask any questions as I wasn't sure if I would be replying now, later or ever, I was just saying what I could see, with my best judgement I assessed the likeliest problems, told what to look for and gave options and explanations of my reasoning. I hope to give enough info to someone that it may click something, like "oh I just changed doing this actually and yeah" you usually figure things out, rather than just asking for more information, delaying any kind of diagnosis. But each to their own, you can disregard my advice if it isn't right, if it doesn't make any sense, or if you have something better to add, but it doesn't make me wrong because I didn't ask him to waste his time, we got to the problem pretty much immediately, without any extra info needed