why ?? I dont get it, let me answer u guys a question.
Cars keep updating and changing, shoes keep updating and changing. Racquets keep updating and changing. It has been shown to increases sales. Which tends to increase profits. Sometimes the goal is just to lower costs. Shoes were once often full hide leather. Firms are also competing with each other. If one maker has a hit racquet like the Radical Series, eventually the other makers will try to copy it and come out with something like the Blade. If that does well the other makers might try to copy that...They are always trying to gain market share from their rivals. IF they stop updating it will make them appear dated. Like they aren't trying to improve the design and their rivals will likely gain market share. The game itself is also changing and younger players might not like the Radicals from XX years ago.
So why don't they keep making every racquet? Having too many racquets is problematic for production as it is difficult to have too many designs and increases costs. Problematic for stores as they have limited space.
You can adapt to the market. Look for a racquet. Most racquets have three years of production. If you get a racquet when it is newly released you normally have about three years to figure out if you really love the racquet. If so buy extra when on clearance. Buy extra supplies to keep them in good working order. After that I would start looking for used ones and try to buy them at a good price and resell the ones that don't match my existing specs well. Sometimes you picked a great enough racquet you can get prostock. Eventually it becomes problematic and it will be time to start the process all over again. If planned well you should be able to easily make about a decade between switches, maybe longer.
Most pros have switched racquets in their lifetime so most players should be able to switch. In all honesty I do miss the early radicals(maybe I just miss how the game was for me back then), but I have tons of fun playing with the Gravity series. TO me tennis is not about constancy, but adapting to the situation at hand. Balls change, courts change, weather changes, people change, game changes, rules change, preferred swing changes, string changes and racquets change...to me it makes the game interesting.