There was a blur effect used on them in older Thaumcraft versions so I thought of suggesting this.
(Comparison between Thaumcraft 5 and Thaumic Augmentation)

Yea I support this change, it even has the blur in TC4.

Interestingly enough TC2 obelisks do not have the blur effect so maybe its up to which looks better.

I think it might have been a limitation or it wasn't thought of back then until Thaumcraft 4 was made. I personally prefer it as blurred as that's what was in 4-5, but I wonder if a config is possible for preferences.

If you look closely you can see that the TC4 effect has particles that are more like the magic mirror effect, while the current TA ones and TC2 use the flux rift effect. I forget why I used the flux rift one specifically - it might have just been before I wired up the other effects.