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Imho cause and effect is slightly mixed up.
Most aftermarket headers, including catted ones, still need cat readiness CEL disabled in ECU tune, as while on catted ones there is reduced chance for it to pop up, it's still there.
Most get aftermarket headers for sake of more performance and they also prefer to pay less. So if you need to get aftermarket tune anyway, most customers prefer (thus "vote" with wallet) to have extra performance and cheaper price of catless header.
To get rid of torque dip one needs to have aftermarket header (not all of them help with that though, most UELs do help, few ELs also (eg. Ace's), but IIRC few didn't, both EL & UEL).
There is nowhere stated that you need to delete cats to get rid of torque dip. Just that most aftermarket headers made/sold/bought are catless.
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