It's more than that. If you look at J-20, 055, look at how China adopts APAR, EMALS, ASBM, China has been experimenting too, but it's better managed, more practical yet faster paced. This can not be explained by copy or stealing. At the end of the day, it's about planning and execution.
Look at the US side, it's either too adventurous, or stagnation. Because of that, their match for 055 is still in the making. It happens not because them being the leader, it's because they are simple lost at what they are doing, both frigates and destroyers.
People used to blame China's system for its problems, because it's not democratic, yadi yada. Now the table has turned. Can we blame US's system for it's problems? Answer seems to be yes. At least they admitted that something was wrong with their strategy, though I think it's more than that.
If you are a leader, you are much more likely to experiment, and some of those experiments are not going to succeed. Being a follower has an easier, and henceforth, cheaper path of development. Type 054/054A costs are low due to being based on existing if not copied technology.
FFG(X) says that the decade of USN experiment is now over, and they are tired of head aches, delayed deployments, and high costs. FFG(X) is still expensive though, ceiling cost is $950 million in 2019 dollars, but that's cheaper now than a modern European frigate if you buy one in 2019. They need to reach that 355 ship fleet on a questionable budget, while top end ships are wearing out from doing duties that corvettes and frigates --- now the LCS --- should be doing. It feels like the USN had its rug removed under its fleet the moment they retired the Perrys without a suitable replacement.
I believe PLAN has a solid foundation with its frigate programs. The Type 054A gave them an indispensable and unmatched workhorse.