Ah, the propagation delay.... That is indeed a major issue. Thanks for bringing that up.

You'd think with it being so important and all that someone might have been working on it, but... ya know...  segwit, LN, rbf...

Oh, is that "Relay Network" I hear you saying?  External solution to a problem caused by internal smelly code?

"Lets send all the transactions to a node, and then send all the same transactions to the node again as a block - just to be sure."
 - "But that causes a huge propagation delay if bitcoin ever succeeds and transactions increase. Cant we just fix it?"
"Fix it? Are you mad!! That would take, like, a 100 lines of code. Its much easier to radically change the way bitcoin works via RBF, segwit and LN first. If they all work out in 2-3 years, we might look at your crazy reckless 100 line code change."