There is no reason this is not a thing.
It’s a simple QoL feature, running back and forth 100x for every craft/upgrade just makes the game less fun.
YES! Please allow access to your storage when in Sacrament and crafting. There is no reason not too.
I very much agree with this suggestion 
+1 Please add this, with how much we need storage and town upgrades, its a very nice QoL feature that feels noticeably absent
Came here to make this exact topic. It’s a shame this isn’t already in the game, should be a no brainer.