I don't think that having more TPS can lower decentralization, after all it is on the way how the developer develop their own blockchain, so we can have a highly capable cryptocurrency for transaction while not sacrificing the decentralization or a very sluggish one with centralized nature.
The thing is that everything in crypto is open source. Means that anyone can copy code from other project and use it in its own. So its not like secrec technology that allow one project to scale while another is still struggling with it.
And its not like how well is code writen, that fast will coin go. You are limited by math and various limitations like block size, node count that can interact with each other and many others. The more centralized your project is the fastest and cheapest you can go. For example Dpos is faster than Pos, because you have only few nodes that needs to "talk with each other" to confirm network transactions instead of thousends. And the lower you go with "main nodes" in DPos the faster your blockchain is.