Maximizing the resale value of a home involves making it appeal to the largest number of people. Adding character risks lowering demand by appealing to niche markets. So you end up with lots of white and grey.
You see similar things all over the place. Want to maximize your career? Better suppress your individuality in favor of copying how successful people speak, act, and dress.
If you've ever heard the term "TikTok Beat" that's a similar phenomenon where the most popular music on TikTok gets copied like a meme by wannabe famous music producers.
It's a process that ends up with bland results as variety is reduced over time. It's also dehumanizing as humanity is slowly stripped away due to inefficiency.