I'm with the camp that you should be doing most of those things regularly.
Now that said, age, experience, old injuries or lack thereof, general fitness level or lack thereof, etc. all play a part in this too in my opinion. If I was 18 and generally fit overall again, I doubt I'd be doing any of these things, but being damn near 50 and not particularly fit at all, they are pretty much imperative.
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