Yeah, but only .000000000001% of the people will ever go to both parks. Even if its absolutely phenomenal, it'll be a DisneySea situation at best where only enthusiasts here will know it exists. It's not like there will be people walking around the US parks saying this is such a disappointment compared to Beijing.
If anything, this a good thing for the US parks as they have someone else paying for the R&D and designs for new rides. If they have to drop $100 million(random number) into designing some new tech for a ride like JW Gyros, by putting it in Beijing first, they can have the Chinese pay for that whole part of it. That way when it comes time to build it here, it cuts that cost out of the budget. This works even if they use new tech for a Chinese IP that will never come here. Use high end tech that they have patents for here. Build it there to get the costs out of the way and work out the kinks, then use the tech for an IP that fits better here.
I don't see a downside to this.