[Vervious]

Not really; there are algorithms where many nodes propose proposals in parallel, but eventually only one of those proposals gets finalized (or they maintain only a partial ordering, not a full ordering). (See Bullshark and redbelly iirc)

The main issue is that someone has got to pick a final ordering. If there’s a universe of millions of possible orderings it seems that the most efficient way is to have a single node pick a single one.