There's some typos I get consistently and the correction is from a very normal word (probably, for instance) to a really seldom used word (poetically, in this example) and I'd prefer to remove poetically from my dictionary than to keep having it pop up.
Repeat this for a couple dozen very common words that consistently give me problems.
Now imagine how frustrating it is having to deal with an additional layer of invisible predictions, silently changing a word after you've typed it and moved on, consistenly only allowing you to say "1/4" instead of "one-fourth" with nowhere to change it ...
I have to deal with this every day because I use dictation do most of my typing. Due to a hand injury (RSI).
I am someone who cares very very deeply about precise and novel expression. It is very very difficult to do that when I have to fight multiple layers of tools that think they know better, with no way for me to provide feedback to the system, as you say"Priority for predictive."
For instance, just looked at how Mack OS voice dictation chose to punctuate and space the string
> say"Prio
Above. Or look at how it misspelled its own name, in the previous sentence!
The original iPhone had a much nicer cursor behavior and placement was easier with a tap or a hold-and-drag than it is to this day. I forget when this changed, I think it was about a decade ago.
I'd add to the list of issues how hard it is to trigger the spell checker for underlined words and how poor its suggestions are when you finally do trigger it.
There are whole websites devoted to embarrassing errors caused iPhone text handling. I can't see why Apple don't bother to fix it. Even small iterative improvements would be OK.