I think it's waaay too early to give Firaxis the win …and this is coming from someone who has spent probably 1000 hours playing XCOM 1/2 (the new ones). The ability to move, shoot, move in one turn, aim between obstructions to hit a smidge of an exposed body part, world exploration that makes sense-- and of course vehicles-- gives this a lot more replayability IMO.
This product, contrary to expectations, had a slow streaming start. Way under what XCOM 2 or even XCOM had.
Replayability is biased by the release of DLCs. This will get (re)played on the sole offer of DLCs. On its own, though, replayability is limited. Even streamers whose job favours multiple runs may not give this product that many runs.
Additions at the moment are superficial. They do not structure decision making.
After watching streamers play XCOM, XCOM 2 and this one, they have not changed one bit their overall approach.
Streamers'approach vary one from another, a matter of personal preferences, they addresses a situation this way, another streamer addresses it another way.
This product allows them to keep to their XCOM ways. A streamer does not change his way to play for this product. They play it as they played XCOM/2.
Streamers keep their differences one from another. They did not play XCOM 2 the same way. But, in spite of all so called additions, a streamer does not change his way of doing. They play it as another XCOM.
None of the additions actually leads to a change in a strategical approach.
One example, the ability of hurting limbs and the decision making associated to it still is governed by the equivalent of comparing hit chances one to another.
Players do not choose to hurt an arm or a leg in order to deprive an enemy of its firepower, its mobility etc They choose it because, compared to other options, this one is the best in terms of damage etc
Just like in XCOM players might favour a high chance hit over a smaller chance hit.
The same strategical pattern redressed.