We have a grand total of 200 spaces in our vault inventory.
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We have 117 (lol) spaces in each individual characters inventory.
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There is a total of over 350 weapons so far.
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There is a total of over 760 armor pieces so far.
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If we were to add all the space we have at out use its 551 spaces shared across 3 characters. The total items in Destiny 2 that can be transferred to the empty space is OVER 1100 (double lol).
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We can barely fit half of all our obtained stuff in free spaces. Unbelievable.
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This was always a battle with Bungie. In the end, they'll add vault space when they feel like it. Just remember that they've lied about Vault upgrades before, and probably will do so again. PS.: I find it VERY stupid that people say that "htere's no need for Vault space", since It'll only improve everyone's experience.