What are you talking about? You can easily jump from i55 to i75 mainhand tool, and have to do hardly any melding to do 3star thanks to i70 offhand. You also don't have to level desynth. I mean, it's smart to do it so you can generate your own stuff as well as take advantage of random drops from dungeons and old coil, but it isn't required if you just want to craft things.

BSM makes ingots required for basically all ARM synths. It's kinda handy since it means you need to do two 4* crafts to make wootz stuff, so there are going to be fewer people in the market so you get a greater return on investment.

I really don't get how people can call themselves crafters and be poor as dirt. Can spend 5-10min and make 500k-1m with zero risk or rng involved.