Is it easy for Hong Kong people to enter the Mainland?

It's easy, but generally no one immigrates.

Hong Kong is a world-class trading port, which is more developed than the mainland. In addition, there are many preferential policies for Hong Kong people to return to the Mainland. In principle, as long as Hong Kong people have a residence in the Mainland, they can certainly obtain Mainland status.

Moreover, if you retain your original Hong Kong identity, you will be exempted from the Home Visit Permit and go back to the Mainland. In Chinese mainland, the ID card is the final identity analysis, application for property and bank account, etc. However, they also have the right to vote and can take up politics in the mainland (but they need to be assessed).