One of the best things about reddit was looking for answers or other users with the same problem as you, and since Google didn’t really help with that anymore and instead insisted on giving you business results, the best practice was to put your search terms in followed by ‘reddit’ and you’d find your answer.
How is this different from just searching for posts on the original “seed instance”? Presumably you’re crawling through everything on all of the instances that it’s aware of, as opposed to the Lemmy built-in search which would only search communities that have a subscriber?