I think the goal is to stock with a bunch of small frags and grow them out. With SPS corals it is difficult to rescape after things get grown in. Your rock gets encrusted with coral and now it has a "Top" side. Much different than starting out with a bunch of fresh rock and placing frags. This tank was initially set up with fresh rock and frags but I was forced to move it. The result is the scape you see above. It is ok but I have never been totally happy with it.The other factor is that colonies are less tolerant of being moved. Changing their flow, and light can be a serious problem.
I also enjoy collecting and growing coral. It is quite satisfying to me to grow a 1" frag into a colony. I no longer have the space to add new pieces. Therefore my inclination is to start over. I figure if I am going to do that I might as well go bigger and delay the inevitable which is another "tear down and start over". I have some other things going on so I am currently weighing my options. I could let the tank continue to grow and tear it down when I am ready for the upgrade or I could tear it down now and go tankless until I am ready for the upgrade. I am still undecided on which way I am gonna go.
First, that's still a beautiful tank regardless. Your comments regarding SPS are very true. I'm planning on tearing mine down for a bit of a re-scape yet have found that due to some of the encrusting of my SPS frags, this is going to be challenging.
I also agree that collecting and growing coral is quite satisfying. It's what drove me to the hobby. I'm suffering the same problem as you.....I need to go bigger. I'm just temporarily unable to do so financially.