I honestly doubt that's true. I'm a non-native speaker, sure, but:

a) When I tried it with my iPhone, there were a lot of errors (1 or 2 per paragraph; I can make a lot fewer of those)

b) A lot of errors were quite subtle, making it difficult to correct

Additionally, I don't want to send my text to any cloud before even sending it. AFAIK, both Apple and Google send the voice recording to them to analyse it, which makes me say "hell naw" to transcriptions.

Bottom line: not interested in voice transcription.

Voice transcription is not always an option. It works decently for English if you are only using it to transcribe simple, daily texts and you are not in public. For other languages or more complex topics, you quickly hit the limit of what voice transcription can do. In public, you may also not want to say everything out loud that you are about to text to someone.

Voice transcription is not usable, especially Apple’s and Google’s. Yesterday I tried to enter a simple reminder: “check Rule 50 deadlines.” It always auto-corrected to “Route 50.”

About half the time when I enter a simple reminder the result is so bad I can’t figure out what was originally intended.