To each their own. I've seen it done both ways.
If it were me, I would probably actually stick with a skimmer, but I am of the opinion that you don't need a monster one as long as you have a well constructed and well maintained scrubber that is producing consistent growth.
SPS can be finicky though, so some may be OK with scrubber only. If you go that route though, my suggestion would be to make it larger than the feeding-based guideline states. 1.5 to 2 times as large as what you feed. This will give you a quite a bit of wiggle room in case you need to add more light, more flow, etc.
And bottom line, on a heavy SPS tank, you HAVE to build your scrubber well. No half-@#$ing it.