But, but, but, other cultures are way more advanced. They would make much greater wonders, but due to oppression, they were not able to develop :'(
Tallest Buildings, XIII - XX century
But we have no heritage at all and we should import it and start from scratch
I'm sure that diversity/inclusion/other types of bullshit sound very much appealing and cute and awwwwwww...
However, there's one big elephant in the room no one wants to acknowledge - by ditching your own cultural heritage, you're saying goodbye to all other values of Western civilization that you're enjoying and taking for granted.
Likewise, by importing other cultures and their heritage, you're importing their values as well, which I will not elaborate here in detail.
Good luck with that.