Things always seem to go bad when I use a pattern with them and can't be bothered trimming them down to 3/8" or 1/4" before I sew them. Things are harder to match up, curves harder to sew then I STILL have to trim down the seam later.
So yeah I am opposed to anything more than 3/8" unless there is a good reason like flat felled seams. If you've done your fitting then theres no need. How often have you actually let a garment out as you've grown out it? Never I'm guessing.