It would be so much easier than seaming them!
So if a pattern says, "CO 28. Knit 5 rows increasing 7 sts evenly across last row.
Continue in St st, increasing 1 st each end of needle on 3rd, then every following 4th row.
Continue even until sleeve measures 6" or desired length to underarm, ending with RS facing."
I can do all that in the round, can't I?
Can I do a garter stitch in the round?
If this is possible, I'll never knit sleeves flat again!