The decision on whether or not you should submit new emulator versions is up to you. It all boils down to what approach you want your emulator's user base to have.
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If your focus is on making the best possible product, then you should only submit updates when necessary. However, if your focus is on making the most accessible and easy-to-use product for your audience, then you should be willing to submit new emulator versions throughout development. There is no right answer here; it’s up to what you want your end goal to be in developing an emulator.