Fixed point math functions

I am pretty sure we (FPGA designers) can manage all stages of design process from modelling through to verification without using the notion of decimal point. But not anymore as we are flooded with tools that force decimal entry. In my place of work, we use advanced dsp builder and it is very powerful tool now. I can see how my fellow engineers are puzzled; they enter the decimal notation until output is correctly scaled by trial and error resulting in really funny expressions and bizarre decimal locations. Another learning curve up or down.