While I think they do deserve an update, I also know why SE will not do it. So far as Matsui has said, we may not be going up by visible levels but we are progressing through pseudo-levels within level 99, as though it were 99.01 or 99.02, as someone else said these RME99 upgrades are probably somewhere around the level 120 region, meaning 99.21 and since it is that way they are in fact a level upgrade, rather than simply an upgrade from nothing. Even if they simply change the stats, the weapon in their eyes is more so a level 120 item than a level 99 item, so changing a level 90 item to fit is putting it at like level 110 level, or 105 level, far beyond where it is meant to be.