Frankly, I don't understand the rationale for TS2 to resemble practically all the features of TSO. What's the point of buying TSO at its price point if one can buy a TS2 and have 99% of functionalities as well as some money saved. The whole existence of TSO was based on the real difference between TS and TSO. IMHO TSO should be discontinued.
The TS2 represents a Tactical Sport based on the newer Shadow 2 frame, while the TSO represents one of the highest versions of the older CZ 75 frame. The CZ 75 frame may be older, but it's still one of the best and one of the most ergonomic pistols out there. Why would you want to discontinue one of the most iconic and the best firearms made? Even the CZ Czechmate and the Parrot are based on the older 75 frame, although rumors are that there will eventually be a new Czechmate based on the Shadow2 frame.
Frankly I have several CZs based on the older 75 frame, TSO, Shadowline, while I also have the newer Shadow2. I love both, but if I were to have to choose between the Shadow2 and the TSO, I would probably pick the TSO hands down. Everyone has their own opinion.
To some the TS2 may be seen as a big improvement, but for many others the older TSO design is their choice. They are both fantastic designs and represent the pinnacle of CZ pistol design. Just because the Shadow2 design frame is newer, it doesn't mean that it's better. There's room for both.