Not entirely true; if you pay attention to the syn process; as long as you acquire 1 quality it's consider a success or at least not fail; the skill Epiphany would increase your success chance if you think it like that; you could use rapid syn in case you're no way to complete - using epiphany in rapid syn -

Quality effect the reward you get in leves; there are 5 tries; try to make quality of those items higher and you will see the evaluation for you work also increase; hence your reward increase also + it increase the exp you earn after finish it. Well you guys may not pay attention to it; but a GSM alway have to increase quality even at those grade 1 or 2 items; cause there are limit for accessory; a +2 or 3 grade 2 would provide you the same amount of def as grade 3 but less slot needed.

Well i agree if that you mean bearable ; yes it would be more fun; but to increase exp reward in leves higher would be unbalance.

Just spamming wont get you anywhere; i wonder why they put in these abilities and difference syn options when no one pay attention how to use them >.< .