It seems odd that cells wouldn’t naturally move in the right directions with some purpose. Which makes me wonder if their purpose is just not understood and these faster healing wounds might have some yet unknown downside.
There's a very cool researcher who used this method to create flatworms with heads (or tails) on both sides. https://www.cell.com/biophysj/fulltext/S0006-3495(17)30427-7
IMO the issue is with unhealthy people, things like poor circulation reduces the body's ability to produce the natural ion gradients and thus why the external electric field helps.
Maybe not just any electric signal will do, maybe frequency and amplitude are a factor as well. A 'healing signal'.
Curious research. We'll see what becomes of it.
The issue with diabetes is that over time periphery blood supply becames problematic which means healing takes way longer, sometimes never healing at all leading to necrosis (dead tissue).
So you could argue that 'accelerated healing' tissue is a poorer grade tissue by some metric, e.g. connective tissue is not as flexible or strong etc. But in diabetic wounds the alternative to 'accelerated healing' tissue could literally be an amputated limb.