I think the discovery aspec would come from these:

• links from your frequently visited sites, community
• recommendations when you ask in more niche group, the frequent there usually can point you to a better youtuber/reviewer.
• or some lazy effort when you just go to the default and search with keywords(while in a container tab) and navigate through the useless stuff.

I complaint because now my youtube feed are filled with other pseudo-science and auto-generated stuff, youtube's algorithm have failed me basically. Half are from my subs and another half are from people or program that are trying to exploit you with those "try this to improve ....." shit and just paste some sounding scientist names.