Why on your knees? When tacking from the wire I prefer to come in standing so I can do a quick step and be at the boom immediately.
Yes, coming in standing may be better, but it is more difficult to master...esp. when you've only come in onto your butt for that past 25+ years ;-)
Landing onto your butt means you first have to get to your knees prior to moving to opposite side. Landing onto knees eliminates that delay.
