This is something you need to decide for yourself. Everyone has their opinion one way or another.
In a standard SCT, ok, you have very little distortion when pushing it to its absolute widest TFOV say with a 30mm 80° eyepiece. For visual, really so what? You DO NOT do serious observing at the edge of the FOV. No one does. And as you are constantly changing eyepieces, the edge of the FOV is not a concern. More significant is eyepiece selection which makes the world of difference with ALL scopes. Chose the right eyepiece for each scope design! You may find you never needed that corrector if you had the right EP for the scope you are using.
But this is very much an individual preference. I have fast Newts, and I don't use a coma corrector, and I'm pushing two, three hours on a single object as I sketch, and my Newts are all push-pull. But I am using the right eyepieces for my fast Newts!!! And my lowly 8"SCT by comparison shows bugger all edge distortion compared with my Newts. I also have eyepieces that I use exclusively on my SCT that are not used in my Newts. Sorry Dunk, I love you mate, but give me those photons that are gobbled up by those correctors every time...
However, this is ME in my choice to not use a corrector. For some people it is more of a matter of because the gizmo is there they'll use it. Which really is fine too. Some insist on a coma corrector, I have no need for one.
Where it IS IMPORTANT with SCT and Newts alike is with photo. Then it is mandatory to use the appropriate corrector or even purchase a factory corrected instrument or the edge of your photos will be stuffed.
Where some people confuse things is mixing photo applications with visual which is much more forgiving due to our human eyes and how we use our scopes which is very different from photo.
So, what's important to YOU?! We can offer you only our opinions and experience. And not one single one of us is either right or wrong or absolute. Just understand that the "which scope equation" has a huge human factor in it that is multi faceted - oh, and do not forget the eyepiece component in this equation too...
Alex.