Weaver was first thing I leveled to 50 and I always found it a tad annoying that it could fail when it is literally impossible for me to fail based off the skills I have on my bar (I haven't used anything to increase progress other than careful synthesis 2 in over a month)

Having said that I would use an even quicker synthesis with a higher fail rate if the option was available. Give me the ability to do 10 at once and I'll take an innate 20% fail rate. I waste so much time on basic mats.