This article has been featured several times on SSC and I read it every time. However I just can't get past
Fourthly it is not possible to define a style which encompasses all the attributes of an object. For instance a font has a font family, colour, size and weight (and this list is not exhaustive). You will have to define a style for each individual element, unfortunately, as this is a limitation of BIDS. However, as there is no limit to the number of functions that you can add to the code tab in the Report properties dialog, there is nothing to stop you having different functions for each type of property that you wish to set dynamically.
As a result, using styles like this just seems to make me type more. Typing in one of the standard colors that I use, or font weight, or size, etc. is less typing than the expression to call the code. The key however, is that I have very standardized reports and I know what settings I want and where, many are already built into my template.
Let me end by saying that I love the thinking here, in HTML styles are a way to make things easier to write and maintain. This is certainly a worthy endeavour for SSRS, but this approach just seems like a bit more overhead than the standard way.