I do not agree that you don't need to worry about biceps as long as you are doing the main lifts and/or your only goal is a bigger total.
I think curls are very important for powerlifters and you neglect your biceps at your own peril. As mentioned, they are important for bench and squats in controlling the bar and all big benchers have big arms, but they didn't get big arms by just benching alone. Yes, you do work them regularly in a lot of your normal lifts like bench rows, etc. However to get them stronger and also to recover better by keeping the blood going to them, it's a good idea to hit some curls a couple times a week depending on your training scheme.
I am Anton Zdravko Martin!
Best meet lifts: Sq 150 Kg (330 lb), Bench 120 Kg (264), DL 160 (352) @89 Kg (197)
Best gym lifts: Sq 375, Bench 280 (pause), DL 385 @205 or less
Goals beyond my wildest dreams, 600 Kg raw total, 200/160/240
Hack away at anything which isn't essential. Do what you love, and do it often. Fazc.
Everything competes for recovery so more assistance is not always the best idea. miked96