For me the issue isn't performing a dash when you want want. That's easy. It's when you manoeuvre or adjust you position a little, and the dash kicks in.
I use a controller on mobile (but this applies equally so to console), and there are times when you want to make small adjustments, but instead end up dashing forward. Usually you make small adjustments when near something dangerous, and having dash tied to movement that way often leads to accidentally dashing into the very thing you are attempting to avoid.
A separate button, or a toggle to disable dash temporarily, would help. It's the reason I avoid anything with dash ability.