Galaxy A7 NEEDS ROOT!

Just joined this site today but had known about it since forever... Anyways the reason I have joined this site in the first place is that there are many people who are so waiting for an exploit, a way to root our Samsung Galaxy A7 s . Many sites including this one claim to have the binary thats able to install super su binary properly but this has been tried numorous times on the Samsung Galaxy A7 SM-A700FD ( Any os version [4.4.4, 5.0, 5.0.2] but none work. They simply corrupt the os and it needs to be flashed its stock firmware in order to boot up but fortunatly there is no data loss. The point is that why does this site claim to have the proper root file while it doesnt and the main question is WHY HASNT ANYBODY COME UP WITH AN EXPLOIT ALREADY? while the phones release after this one have their own root processes already( Samsung). Its just a sincire request from me and a lot of other people out there, that please xda help us and create a proper root process for the Samsung Galaxy A7 ( SM-A700FD) .