The parent wasn't talking about Bitcoin in particular though. Newer systems like Tendermint finalize transactions after a few seconds by running a consensus alg

The parent wasn't talking about Bitcoin in particular though. Newer systems like Tendermint finalize transactions after a few seconds by running a consensus algorithm after each block. We're working on a system with a different consensus algorithm which should have subsecond latency. There are also layer 2 systems which can provide almost instant latency, albeit with some caveats.