I'm not so sure we should get rid of it. Inventory related code and design problems are unique to games, and this tag provides scope and discoverability to that unique problem domain.
I do think it's possible to have expertise in implementing these kinds of systems and designs, so I don't think we should get rid of it.
This is probably opposite the stance I would have taken even a month ago, but in reviewing our catalogue of tags recently I've started to come around to the idea that we're too sterile in our handling of tags, increasingly sacrificing domain-specific tags on the alter of "can you be an expert" dogma that is perhaps part of the reason we have some seriously bloated catch-all tags like game-design.