I think the DM in that campaign was doing a (in his words) "boot to the head". Wasn't much vindictiveness in it, just the old "don't do stupid things". We were only 3rd level and had no access to magic that would have helped carry all that stuff. As it was mostly a voyageur style campaign the only thing that could be readily replenished was water (except in deserts). Also I think vacuum sealed packs were beyond the technology of the campaign. Medieval style tack or rations would last for a good long time provided you took the effort to keep them dry and in a cool place. But fording rivers, crawling through swamps and delving in dungeons would cause leather armour to rot let alone rations. I think the player was either trying to avoid excess paper work like you suggested, or he really didn't want his character to run out of food again after his previous one did. Or he was passive aggressive and was making a statement.