Wow, I just spent several hours today trying to integrate Google's text-to-speech with a simple webapp. Here's a comparison.

Google: "There is a multiloculated fluid collection adjacent to the liver."

AssemblyAI: "There is a multi located fluid collection adjacent to the liver."

Google does better out of the box, but it isn't customizable (e.g. to a medical vocabulary). I think this is a major limitation of Google's approach, but certainly something they might offer in the future.

I do think AssemblyAI needs to offer a real-time dictation as this is the major need in medicine.