I am trying to figure out the logic behind this decision....Why would you not gain edge from making a sound tactical move, but by making a less sound tactical move, you can get edge.
So, here is a direct quote from the CRB about what edge represents in 6e:
"This critical statistic measures the undefinable, putting it on tricky ground right at the outset. It is that combination of guts, risk, and heedless ignorance of danger and good sense that lets shadowrunners survive where others do not.".
Now before I go further, let me be clear I am not a fan of the new system. That said, I think Jayde Moon hit the nail on the head. It doesn't make a damn bit of sense, but it was not meant too. It was intended to let the system work the way they wanted it to.
The attribute is very poorly defined, which allows a lot (entirely too much imo) room for discrepancy between perspective, so that it can do whatever the table in question wants it to while infuriating those of us that would just appreciate some sensible consistency.
As defined, tactical acumen has very little to do with the attribute, even while it is a core element of how you actually wield the attribute mechanically.