What I have learned is that sometimes, professional growers have learned a few tricks over the years about growing certain plants and they might generously, helpfully, share this information as they pass along the plants.
That is what is happening here. The vendor must really believe in this advice if he is even supplying you with the oyster shell.
It is really your choice, though, if you want to follow this advice or follow what has always worked for you in the past with these types of orchids. As long as you understand any differences between the new hybrids/species and the ones of that type you are already growing, you can make the right adjustments for your own growing conditions.
Good luck with your new plants!
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I decorate in green!
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