Yea absolutely! So its two separate issues but both are features accessed by speaking with your retainer.

1.) accessing the market board in order to specifically SELL goods and collect funds.
2.) accessing your storage via your retainers. This is currently the only real method of storing excess goods.

My suggestion is to address issue #1 by simply allowing players to sell their goods directly from the marketboard. This cuts out the need to talk to your retainer, rifle through their text each time, wait for both their entrance and exit animations, rifle through several different retainers to find the item your looking for etc etc. All by themselves, its not too bad, but together, and having to do it every time, makes the whole process uninviting. so by simplifying that by just allowing access directly from the marketboard you cut out a large amount of unnecessary actions and time consumption. I believe this will even improve the overall economy of the game since selling on the MB wont feel like such a chore.

to address #2, again for the same reasons as #1 which is the unnecessary clicking around through text, entrance and exit animations, having your storage split up across several retainers so you have to rifle through all that nonsense in some cases multiple times to find what your looking for, INSTEAD why not just add a metaphorical "item Bank" where there's an NPC by the market boards in major cities where you just talk to them, and a storage window pops up that looks similar to your inventory bag or your chocobo saddle bag, just much much larger and with multiple tabs. That way you can just pop right in, drop your excess goods off, clean up your inventory, and bounce right back into your gameplay.

Hope that answers! Id love to hear yall's thoughts on this!