Whoa, lighten up Francis.
My comments were based on the information provided, left out, and gleaned from the photo. Based on the grain size and depth of the observed sand bed, the lack of referencing any sand sifting gobies and other associated sand clean-up crew, the observed conditions in the photo and the age of the tank, with that info, the OP was given, again, IMHO, other than good advice. I never said I was an expert, I simply made observations and inferences from the provided information to surmise a reasonable conclusion as to the cause of the conditions now being experienced and a proven method to tackle the said condition. Somehow you took that as a personal attack on your husbandry methods.
There certainly are times that you may not want to disturb the entire sand bed in deep-sand beds, for example. I'm still a proponent of at least vacuuming the top layer of a deep sand bed. I have had both deep and shallow and now BB, again. BB is the best, IMHO to eliminate a possible contributing factor to increased nutrients or trapped nutrients and associated issues related to these nutrients that the OP is experiencing. Vacuuming a sand bed is a personal preference but largely dictated by the type of sand, grain size, depth of the sand bed, sand clean-up crew in the system, the number of organisms kept, type of organisms kept, and the type of reef that is the goal of the reef keeper.
Even in nature, the sand is always maintained by tidal surges, wave movement, organism manipulation, and nature's clean-up crew. Believe me, that is one deep sand bed at the reef fringes, at the drop-offs, in the lagoons and the channels feeding the lagoons. So, even deep in the lagoons where there is considerably less sand turn-over, there are different types of organisms making up that reef than what you would see at the reef crest or drop-offs. Again it depends on a lot of factors and what type of reef system the aquarist is attempting to emulate. Regardless, the sand is always being turned over, be it constantly, multiple times per day, or seasonally. Generally, we are trying to replicate the conditions observed in nature, and in doing so we need to clean the sand, at least occasionally. I'm sure that there have been aquarists that have been successful, not touching, maintaining or having their sand beds maintained for many years but I am dubious of this and have not heard of anyone with this success. I'll bet, based on my experience, conventional wisdom, anecdotal evidence, scientific observations, and general chemistry, you may get two perhaps three years before the lack of sand maintenance will catch up to you and problems start to rear their heads, identified as sand-bed related or not. There are many issues that are never resolved and then confound the aquarist which in turn lead to other problems that snowball into a tanks slow but certain demise that end up being the unreported result of not maintaining sand beds properly. Then again maybe not. Check back with me when your system has been up for more than two years without any sand maintenance.
If you want to eliminate a potential problem, vacuum your sand bed or go BB if you can stand the look, but vacuuming on a regular basis from startup certainly WILL NOT cause the tank to be wiped out as the OP was counseled. Not good advice, IMHO.
