Alexa is trash. If you have to basically hold an agent's hand through something or it either fails or does something catastrophic nobody's going to use or trust it.

REST is actually a huge enabler for agents for sure, I think agents are going to drive everyone to have at least an API, if not a MCP, because if I can't use your app via my agent and I have to manually screw around in your UI, and your competitor lets my agent do work so I can just delegate via voice commands, who do you think is getting my business?