Canada ranks highly on these lists partly because they have a large population group that speaks a second national language and were relatively serious about independence.

For whatever reason that objective "diversity" doesn't seem diverse to some people.

They also seem to have more but smaller (as a percentage of the total) ethnic groups than the US. Again, while mathematically more diverse than a big chunk of African or Latin-Americans, people seem to view this as less diverse.

English, German, Irish, swedish descent = Christian, white population, all speaking English as a first language, all from similar cultures.

It’s way more diverse in Sweden. I lived in NYC, and have travelled a lot in Sweden. Nowadays, large Swedish cities are much more diverse.

Even if you lump all the european people together, the fact remains that Stockholm is probably 80% European and New York City is less than 30% European.

But NYC’ black or latino population is (mainly) Christian and mainly speaks Englsh