Nothing wrong in making your own Pathfinding System! Made myself a couple to, to get the fundamentals going. Someday i found the Arongranberg Pathfinding which is just an incredible asset, performs very good, very easy to implement and can be extendet for every game rapidly.
Since that im using the System regularly for all Prototypes and Games. In my opinion, this is on of the most useful Assets out there.
keep making Games!