....and what title was featured on SD! in 2002 and 2003? The WWE title....
That, combined with SD! having Lesnar, Angle, and other stars, storylines and factors, was the reason why SD! was considered the OTHER A-show at the time, as opposed to the B-show it was for most other years
The WWE title will ALWAYS be seen as the top title by fans. Period. No matter what other 'world' title someone tries to come up with. Yes, there was a period when they genuinely tried to push the WHC as being equal to the WWE title....and that was upon its debut when Triple H was hogging it and using it to increase his championship reigns. He held the belt for almost 2 years combined in its first 3 years.....then his new toy finally got old in 2005, and he never touched it since (as an individual belt)
And even then, fans knew it was the 'weaker' title, which is why the WWE eventually dumped it onto SD! when it became the undisputed B-show. Dudes like Christian and Mark Henry winning it was only a big deal because they finally won a 'top' title in the company....but we all knew them winning the WWE title would have been better
So since the alternative 'world' title will be seen as #2 regardless.....why not have the IC title as the top 'world' title on a show, where they can treat it like it's actually worth something for the first time in years? Unlike the WWE's WHC or whatever new title they come up with, it already has a respected decades-long history where it was held by some of the greats; Savage, Warrior, Perfect, Bret, Shawn, Razor, Austin, Rock, Jericho, etc......
We need to be honest with ourselves: dudes like Rusev, Owens, Bray, Cesaro and Ziggler aren't winning that WWE title. I'll even throw in Ambrose and Styles. Yes, I went there.
So why not give them shine on a show where they can fight over the IC title in major feuds as if it's the WWE title? Yes technically it would be the weaker show, but wouldn't that be better than the current atmosphere of having them in forgettable throwaway IC/US title feuds that get lost in the shuffle of constantly-promoted WWE title feuds? And who knows.....depending on the show quality it could still manage to get viewership/ratings as good as Raw, or even better
At least give them a year or 2 of main-event IC title feuds on SD!, before drafting them to Raw to pretend like they have a shot at winning the WWE title when we know damn well they don't, and will just get lost in the shuffle