I agree with you but not totally.Although CAs are the best people for tax purposes,but i would like to say what Mr Kapil Sibbal said when he became Union Minister for Science, Technology and Earth Sciences. in Manmohan singh Cabinet in 2004 on being asked why he chose this portfolio instead of law ministry,he said as i have many friends in law fraternity,it would not have been possible for me to do justice to my ministry if any body would have asked for favours from among my friends. Same goes for CA,
Secondly the post of an IRS officer is of an administrative nature also. They have to deal with various govt agencies as well,and we all know we CAs are not very good at presentation aspect.
But the govt should separate IRS on the lines of IES,where only engineers are allowed to sit for the exam..