why is the rage? coz i hate it when "individual clients" tell a programmer what to do...
Clearly, you have never done any freelance work. If you are working as a freelancer, your job is to hear what your client has to say and do it. If you are not up for this lifestyle, start your own company.
Costa knows exactly what he is doing. His team is already using SASS and I assume he would like to keep things consistent. If you are not a flexible programmer, don't expect to advance much in your career as a freelancer or full-timer.
I have noticed a couple of other not-so-carefully thought of comments you wrote in other topics. It's a good idea to go over your post and clearly explain your point. This would avoid your remarks being mis-interpreted as trolling.