In beta it seemed Rapid was a valid option. Shortly after release they quickly buffed standard to be the default option for pretty much every case and nerferd the durability loss of rapid to be way too high and give it a high failure rate. Now the only thing rapid is good for is breaking your synth faster. 2 rapids and I lost over 50 durability each after it went unstable with an element. Ridiculous. A valid rapid option helped break up some of the monoteny of crafting if that option was still valid in some way and made synthesis faster which I think could use a boost to the time it takes to craft something.