In the past, as new zones have come out for the end game, many of the items would upgrade armor and items from past zones. This allowed folks to keep the high-valued augs insered so we were not burning Lilus solvent to remove the augs over and over. I have noticed with the two newest T9 zones, this is no longer the case. I think its fine as there is an upgradable t9 armor set, however, many of the new items have some great stats and worn effects. Any chance there may be a reconsideration as to the cost of the solvent or some change to removing augs as most of these have 4 slots. Also, I have not completed any yet, but it seems that we are able to upgrade some of the old augs. Painful to remove the aug to upgrade it just to put it right back in.
Unless you are an idiot like one of my mains and deleted these old augs. =)