"Common" implies frequently occurring. 3 out of 4 failure is not common. Its uncommon. It happens yes. The sim I have access to indicates there is statistically a 2-3% chance of this occurring.

Regardless, yes, one of the advantages of a flawless synthesis approach is in the progress being more recoverable when reliability fails (while still being quite efficient). Personally I've made gobs of items (I'm the master crafter for an FC of 500 members with around 200 active). I also haven't NQed a single 2* red scrip item. So yes I understand the pros and cons to different approaches, occurrence rates, recovery etc.

I am still exploring my full feelings around how I would use flawless synthesis in a full approach of my own using my preferred approach. Personally I'm not a huge fan because I don't like swapping for macros and I make magnitudes more items via macros than by hand. With this said I think I'm at a point where I could fit a flawless synthesis approach in with my macros.