Chronological order doesn't mean unbiased. LIFO is an algorithm. The only way to remove bias from the platform would be to deliver 100% of the available content at equal priority. But practical time and space limitations make that impossible. If a provider is nothing more than a dumb pipe moving bits from an input queue to an output queue, then the control of the moderation moves further away from the end user and into the hands of the content creators. Whoever is better and faster at getting their bits pushed into the pipe will be able to censor by brute force any opposing viewpoints.

Better search won't change that. If the current state of search is trying to find the one independent needle in a pile of commercially produced hay, imagine how it will be when the farmer didn't hire someone to shovel all the manure out of the barn.