Currently my gamepad is brand new, and it provides little issues with the new dashing feature.
But I can already see the issue coming that it will exhaust the left analogue stick quickly due to the harsh and quick movement into the same direction twice, and that quickly after another since dash gets canceled when hit by a mob.
Since the right analogue stick doesn’t have any use right now, why don’t you allow dashing also via using the right analogue stick or e.g. by using the analogue cross?
That could prevent the extensive exhaustion of the left analogue stick and provide a stress-free alternative to repeatedly using the left analogue stick twice.