At least in America the greatest hurdle imo is both the cost of labor and the local/state red tape that has been pushed from local grid operators. Balcony solar should be available in all states across the country. I know on my state they require all this additional steps to get solar (including a bs solar study for your home) which just amounts to a significant permit fee which makes the investment less economical.
You're right on the labor, that only goes up. On the local/state red tape kind of. You can sell a residential solar system and get a contract signed and installed and get PTO within 30-60 days, which isn't terrible. However, utility scale solar farms can take 3-5 years before you even break ground at the earliest but that's a different story. There's a ton of local/state rep tape there so you're def right there.
