I'm a screen printer at heart, but have a passion for dtg, (which some of you could probably tell).
So when going back and forth between dtg and screen printing, even I, an advocate of dtg have a tendency to switch to screen printing from time to time. When I was in college for illustration, my teacher watched how I would draw portraits, etc. He wanted to show me something so I paid attention. He told me I should be tracing instead of taking the time to draw it out. I could draw, but tracing would allow for quicker speeds in reproducing something.
This always stood out to me. In a production environment, the customer doesn't care how you do a job, just as long as it's done on time and with quality. That being said, here is a job I just finished for someone today and I chose screen printing. It's a 3 color job on a black T and there were 145 shirts. I could have easily set up my direct to garment printer to do this, but I didn't wan't to go through the additional steps for 145 shirts. So I chose the quickest and most economical method.
A lot of screen shops don't see the advantage of dtg, but I chose some time ago to incorporate both.