If it was cheap and easy, I would have more tanks and be able to experiment more and be more creative.
Could have a dedicated tank for themes of interest like I have with freshwater. Like have a lagoon, macroalgae tank, a pistol shrimp goby tank, a mantis shrimp tank, mushroom only tank, different anemone tanks. Biotope tanks. NPS tanks, and seahorse tanks etc
Cost and difficulty really makes us limited on what we can focus on. You can’t have time to make a ton of habitats all thrive when the barriers are so high.
While a challenge is great for a sense of accomplishment. There is also a great way to earn the feeling of accomplishment when you are able to express your creative ideas that are currently restricted