Its not a simple of matter of "we need this now". We are using a free service (booru.org), so whatever feature that goes into booru are truly dependent on them.
Reminder that booru.org has a patreon and if it reaches the second goal of $500 then the booru.org staff can resume "development", which could mean new features for this and all the other boorus
I think maybe 2 of my cards have ever made it to 20+ I wish I could see the up-votes and down-vote totals because it seems there are sometimes sweeping down-votes just going through down-voting everything.
My approach now is just put the card I like in my favorite folder and use them as catalog for searching by authors. It works better for me than relying on vote system since we all have different beauty standards.