Plus you have 4 other versions of the film without new effects to choose from - it's not like he's pulling a Lucas with this, hell he's even including a version that predates the theatrical release that's never seen the (official) light of day until now.

Plus, I'm sure if the new effects stand out too much, someone'll take the scenes with the original effects and splice them into the Final Cut as a fan edit, or "preservation", or whatever. But it sounds to me like they're welcome changes, the kind of stuff that wouldn't have bothered me so much if *that* had been what the Star Wars SE was about.