Yes DO let you handle long lived websocket connections.
I think this is unique to Cloudflare. AWS or Google Cloud don't seem to offer these things (statefulness basically).
Same with TTS: some like Deepgram and ElevenLabs let you stream the LLM text (or chunks per sentence) over their websocket API, making your Voice AI bot really really low latency.
e.g. Deepgram (STT) via websocket -> DO -> LLM API -> TTS?