A one-size-fits-all AI voice fails. For a Japanese healthcare client, ElevenLabs' agent used quick, short responses for younger callers but a calmer, slower style for older callers. This personalization of delivery, not just content, based on demographic context was critical for success.

The need for emotional connection isn't limited to consumer products. All software is used by humans whose expectations are set by the best B2C experiences. Even enterprise products must honor user emotions to succeed, a concept termed 'Business to Human'.

Voice-to-voice AI models promise more natural, low-latency conversations by processing audio directly. However, they are currently impractical for many high-stakes enterprise applications due to a hallucination rate that can be eight times higher than text-based systems.

While Genspark's calling agent can successfully complete a task and provide a transcript, its noticeable audio delays and awkward handling of interruptions highlight a key weakness. Current voice AI struggles with the subtle, real-time cadence of human conversation, which remains a barrier to broader adoption.

There is no one-size-fits-all agent design. Business users need optimized, structured agents with high reliability for specific tasks (e.g., a sales assistant). In contrast, technical users like developers benefit most from flexible, open-ended "choose your own adventure" coding agents.

While many pursue human-indistinguishable AI, ElevenLabs' CEO argues this misses the point for use cases like customer support. Users prioritize fast, accurate resolutions over a perfectly "human" interaction, making the uncanny valley a secondary concern to core functionality.

The magic of ChatGPT's voice mode in a car is that it feels like another person in the conversation. Conversely, Meta's AI glasses failed when translating a menu because they acted like a screen reader, ignoring the human context of how people actually read menus. Context is everything for voice.

The most valuable use of voice AI is moving beyond reactive customer support (e.g., refunds) to proactive engagement. For example, an agent on an e-commerce site can now actively help users discover products, navigate, and check out. This reframes customer support from a cost center to a core part of the revenue-generating user experience.

AI voice isn't just about cost savings. The technology has improved so much that it often provides a better customer experience (NPS) than human agents. This dual benefit of high ROI and improved experience means customers are eagerly adopting these solutions, creating a powerful market pull for founders.