Hey, AccFin isn't THAT easy. We study some of other stuff economics and maths (only to a small degree) students study. Naturally, if you're good with numbers then it may seem easy to you.
AccFIn may be unpopular/uncompetitive depending on where you apply. I know for A levels all the uni's i applied to (LSE, Warwick, Soton and Bath) all asked for AAB and IB 36/37 (Bath and LSE, respectively) . Places like i mentioned AccFin can be fiercely competitive to get into.
And to a certain degree employers may prefer economics students over AccFin students, HOWEVER it depends The AccFin student may have better references, a first degree (the econ may have a 2.1) etc...