One would anticipate the people who've already owned snap together molecule sets for years have either already figured out a good way to make sure a bin of parts stays where it's put or accepted that it's their fate to order more of things sometimes.
Similar to teaching yourself to always put tools back in the toolbox immediately after use lest they go for a walk, really.
I mean, I do see your point about -you- not wanting to deal with a bin of parts, I'm not sure I would either - but for the people who've already encountered that problem and found a way to deal with it that works for them, it doesn't seem like it'd be an obstacle.
I guess that answers it for me and seems to reinforce it is strongly skeuomorphic — it isn’t really possible to have a box of aminos/proteins in the same way you can have a box of Hs Os and Cs. They wanted a box of parts and this is the closest thing.
Similar to teaching yourself to always put tools back in the toolbox immediately after use lest they go for a walk, really.
I mean, I do see your point about -you- not wanting to deal with a bin of parts, I'm not sure I would either - but for the people who've already encountered that problem and found a way to deal with it that works for them, it doesn't seem like it'd be an obstacle.