Swing trading does not require the ability to place an order in near real time. You need to have done your DD and generally you just place your order the day before you expect your event.

We don't know that blockchain transactions are inherently slow and we haven't verified that no decentralized architectural/algorithmic/structural solutions exist to coordinating trades. In fact, I can think of one or two. So I'm asking you for data, not hypothesis. Do you have any info from your research about trade order execution times on p2p exchanges over time or userbase size? Or is it just your conclusion from anecdote?