The value of crediting the credits is that it is usable in any situation by the characters, sellers, and other purchases or sales, not just storages. If you put money in the trunk inheritance is done to store it it has no interest to delete the option if you can use the credits from the sellers to the interest becomes more interesting.
to make this kind of modification without thinking about the practical aspect is really not smart, what you look for in a game is the practical and fast access.
if I had for all my characters access to credits that I have in the trunk legacy for my purchases I will find it easier