Made this as there was some discussion about it in another thread that was kinda going off-topic. So here, now there's somewhere to discuss differences and advantages/disadvantages to each without derailing other threads.
1. It lets us avoid using a roll high system for tie breaker (which really would be a case of having a mechanic that runs contrary to everything else).
2. It lets us avoid using a roll low tie breaker which has a really non-intuitive and weird spread of results.
3. Ties in skill use are pretty common in real life.