This is a common talking point that is not true. It’s not your fault for echoing this because I have heard it so many times from so many smart people. But the truth is that TPS is a great metric for scalability.
The issue isn’t that comparing the scalability of a UTxO chain to a global state chain based on TPS isn’t fair. The issue is that scalability is only one piece of the trilemma. Every single time I see a TPS comparison it completely neglects to compare decentralization or security (which are literally the key value propositions of blockchain).
You cannot achieve disproportionately high scalability without sacrificing decentralization or security. Yes, Solana, Sui and others have higher TPS and thus higher scalability than all the UTxO chains you mentioned (it’s not even comparable they have literally thousands of times higher TPS) but they are as far behind in security and decentralization as they are ahead in TPS. Literally no one can participate in these super fast networks. You don’t have the hardware to run a node. No one on your block has the hardware to run a node. Hell I would bet no one in your entire town has hardware to run a node. You would have to drive to the nearest server farm and ask if maybe they have something that can (and all the fans and electrical infrastructure for it), and even then you still wouldn’t be able to see the chain history (for that you would probably need to take a flight to a massive industrial distributed storage center). These networks are not decentralized.