Removing TR cache could take quite some programming time and introduce new bugs in worst case.
But the devs could end inventory nightmare if they wanted:
Bring back named rewards on quest reward & chain reward (items from all quests in the chain). Maybe VIP perk.
That would mean you could always re-farm without too much RNG involved. So you only need to keep keep endgame items with mythic/reaper on mules and just refarm stuff for TR (if you change builds just get items for your next TR while leveling your current build).
But the devs could end inventory nightmare if they wanted:
Bring back named rewards on quest reward & chain reward (items from all quests in the chain). Maybe VIP perk.
That would mean you could always re-farm without too much RNG involved. So you only need to keep keep endgame items with mythic/reaper on mules and just refarm stuff for TR (if you change builds just get items for your next TR while leveling your current build).