Starting with (and including) the Mi 9T Pro, all Xiaomi smartphones that launch internationally are shipping with Google's Phone and Messages apps. This change has finally been acknowledged by Xiaomi on its official forums today, and it's definitely been a long time coming.

Thus, if you have a Xiaomi handset running a Global or EEA ROM, you no longer have MIUI Dialer and Messaging installed. The Chinese company is giving up on these and using Google's alternatives due to "privacy laws and restrictions around the globe". Xiaomi continues to explain that Google's Phone and Messages use Google Mobile Services, which is obvious and doesn't really get into the nitty gritty.
Visit below
https://www.necticon.com.ng/xiaomi-will-continue-to-pre-install-googles-phone-and-messages-apps-on-global-devices/

I dislike Google messaging and dialer apps. It's that single reason I chose to buy redmi note 7 instead of redmi note 8. They should at least give us the choice to reinstall miui app if we want.