Its not simple man. We know that. But as said, its short sighted. They advertised all this new gear, new weapons. New stuff.
But no space... like ok. Thats not smart on their end as a large part of the community likes to collect things and a big part of destiny is seeing change in the world, but still being able to relive the past - whether thats by playing old story missions or pulling out old gear or playing with old weapons.
Its become a huge part of the fanbase and bungie would be short sighted to not have addressed that.
I'm not saying it's something they can just instantly do, but it's not like this DLC just came out of nowhere. If they didn't plan on giving us more space at some point, it's extremely short-sighted