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You can either become a designer or learn to think like a designer (long-term process) or just add a designer to your team (tomorrow) and let the designer do his part.
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I was asked by him to only use box shadows ... this is not a technical question
I highly suggest asking your developer why he made this request. I'm guessing that the reason is technical, namely because blurring is quite an expensive operation compared to most shadows. It could be because of design reasons but the much more likely reason is that many blurs ...
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Is there a rule/principle that says one should only be using box shadows?
Yes, and it is that the developer asked for it. The thing is that a company can simply have some design rules.
In this specific case, a shadow does not need an additional DIV element, a blurred rectangle probably does.
Besides that, no. You could make a webpage using blur all over ...
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