Problem is that Apple's services are lagging behind their competition. Issue is that each team at Apple has their own stack. Imagine the amount of overlap that they have! They have hundreds of people who are doing the same work but for different teams. That also explains why Apple's so addicted to AWS/Azure/Google's cloud services.

And Siri's fallen further behind their competition. Don't forget, Siri was the first (major) assistant on the market and Apple had a year or two of head start on their competition. But that advantage quickly evaporated because of Apple's neglect. Siri's creators left and formed Viv because Apple lowered their ambitions and didn't give them the budget they wanted.

That's all Eddy Cue's fault since he's the one who's in charge of these teams. It's as simple as that. And just because he's been at Apple so long doesn't mean he's great at his job. It could as well mean that he's accumulated so much power that he's untouchable.