I also think that the shards should be enough to upgrade 2 items. There are simply too many fragments lying around unused, because the ratio of fragments to fragments is not right.
In addition, the crits in the game have risen sharply. If this happens during a boss fight, the Arcadiacoins are lost each time. If I'm not back in the Boss room after a crit, I die on entering the Ini.
You should at least have the opportunity to come in front of the boss room to get the coins.
As it is now, I'm being punished for flying out of the game