I actually built an app to accomplish this exact thing as I was finishing building my home and was clueless when it came to interior design. I'm genuinely astonished by the capabilities of these models with regards to this, and it feels vastly underutilized by the general populace. Being able to try out multiple paint colors in seconds, or add real furniture or wall decor from Ikea, or move objects around instantly - it still blows my mind.