i will always keep them. because many people like me have hope, that they could change character bound items to roaster bound items. i also heard, that the KR version have vendors, where you can exchange the items for other things. but not sure is it true
objection your honor this would not be a harmless change. so the 500+ bound leapstones that each of my alts have been farming passively from unas, boss rush, and chaos would now be able to be sent to my main. along with all mats from cubes, mats from character specific quests.
If they were to just do a sweeping wide change turning all bound mats into roster bound, the game would be UNPLAYABLE without alts, and with alts, it would take zero time at all to get any honing done. the game would have to be rebalanced completely.
They cant change the t1/t2 mats that came from islands or whatever because there is no trace linking them back to those sources. they are mixed in with everything else. Sure, they could change it for future players, but this would require them to create a whole new set of materials which are roster bound (since there are no roster bound honing mats in existence currently, only bound or tradeable). But besides, how many players will this impact? almost everyone is past that point.
overall, it is fine, and people just need to realize that they made a mistake and learn to not make it again if you plan to play the game for longer than 3 months it really wont matter anyways, and eventually people will figure out how to open what they need.
The general consensus is that this would only apply to T1/2 materials since at no point would you ever been forced to delete T3 materials on any character
Perhaps even make it a stronghold research that lets you convert materials into roster bound at a 3:1 ratio. That way you are still removing large chunks from the economy while also making players feel the work they did to gather them resources was not in vain