I'm not saying having 3 failures is the end of your dream job at the legacy someday, but all I'm saying is you're competing with 10000 pilots with a better record and when it comes to hiring people with similar experiences they will select the one with few failure.

Where would you draw the line as deal breaker regarding failures? 3? 4? 5? 6?

All I'm saying is why not go to a WO with a flow compare to a regional without one if you already have some obstacles (in this case failures).