What I mean is they already had i9 and i7 with same core count, and seems counter productive for added concussion to buyer.
Could you guess what separate between 35W 11900T and 125W 11700K? Is it guaranteed that "higher price" 11900T perform better than 11700K? I bet they have 11700T in the making.
As said above, T-series Intel CPUs have been around for ages. They aren't common among consumers, as ... well, they're limited to a 35W PL2, so they perform a lot worse than no-suffix or K SKUs. This is reflected in their much, much lower base clocks. If you're not able to tell this from a spec sheet, you shouldn't be buying CPUs. They aren't meant for the same markets, but mostly for OEM SFF workstations and similar. (T SKUs are often difficult to find in stock with retailers at all due to very low consumer sales.) Will the 11900T perform better than the cheaper 11700K?
NO. And it's not meant to. Outright performance isn't all you can pay for; maximum performance within a small power envelope also has a value (as do many other configurations). So for the 11900T you'll be paying a premium for getting the most powerful 35W Intel CPU around. Which will be slightly faster than the 11700T, which will be slightly faster than the i5-11600T, and so on, and so on. Regular 65W SKUs or 125W K SKUs will beat these every day of the week. And that's fine.