I've got a few macOS apps and all are signed and notarised. The cost isn't that bad, and depending on your target audience, it'll help prevent a lot of confusion. If you're looking at the App Store, it is mandatory. There's also [company managed] Macs where the end user isn't even allowed to click "Open X anyway"

Get the membership and integrate the signing & notarization process into your pipelines. 😊