Apple is gearing up for the launch of iOS 26.4 in the spring of 2026. Internal concerns are mounting among engineers and senior executives about the readiness of the platform's flagship feature, a long-delayed revamp of Siri. Mark Gurman, in his latest Power On newsletter, reports that testers working on the update are already flagging performance issues with the upgraded voice assistant, raising fears that it could underwhelm users and exacerbate the company's ongoing AI struggles.

Gurman highlighted these red flags in his latest dispatch, writing, "I strongly believe there will be more senior members of the company's AI ranks hitting the exits soon, especially if the new Siri coming in the spring falls flat. Already, there are concerns from people testing iOS 26.4—the OS version slated

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