AnkiWeb could certainly use some improvements (e.g., categories and better add-on discovery). While a new add-on platform can improve some aspects, it can also cause user fragmentation as it is not a built-in part of Anki. I’d suggest instead looking into building an alternative UI for the add-ons list, maybe using something like Anki Addons Dataset: a detailed list of addons, unless if the problems you’re trying to solve are related to the add-on distribution/update mechanism and they can’t be simply fixed by contributing to Anki.
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