I don't think it would be a great loss. After playing for two days on NA I was quite surprised how much stuff I forgot in 12 years. I knew old Aion was slow, but actually trying that again...wow...it's hard to play it again. The teleport from Pande startpoint to Pande broker is not there yet and even running that path without speedboots was kind of painful. Most of the time I was thinking how patient we must all have been to play it. When I remembered about how many mats were needed for last 30 levels I soon realized that I simply don't have the will, energy or nerves to do it again. Sure it was fun back then, but so many things changed meantime it's hard to look back. My memories coloured brighter picture than what i've seen. It's just nostalgia vs. reality.
TBH the hardest part I found was crafting it hurt as I had master in every craft before they removed it use to love crafting and now I am doing it again.