It's more that the most cursory of considerations show that your claims don't have merit. *I don't have to dig into more complex sources.
And that worked both ways, which you're ignoring for some reason. *The Romans weren't a cultural titan that resisted all outside influence, and I have no idea where you're getting that from.It was most certainly official policy, they actively encouraged the leaders of conquered populations to become more Roman and hoped this would trickle down, this is widely attested in sources.
It's literally multiculturalism, you just don't understand what the word means.That Roman culture changed is neither here nor there, every culture changes over time due to internal and external influence, e.g. English culture was influenced by Empire without being a multicultural society until after Empire collapsed. Do you think we needed to import Chinese people along with the tea? Of course not, we just adopted bits of other cultures we liked, that is not multiculture, it is monoculture with a gloss on it.
Again, completely wrong. *Their multicultural attitude had huge influence in their capacity to expand their borders, since conquered peoples could submit to Roman rule and continue living pretty much as they always had, so surrender was always an option to protect one's people.There was no benefit to the Roman Empire from multiculturalism, in fact many of the most pressing issues they faced were due to their lack of success in creating a monoculture, which is understandable given the vast area they had under their control and the practical challenges that presented to an ancient civilisation.
From Masada in the East, to the Iceni in the West, multiculturalism provided nothing but headaches for the Romans.
Hell, you just admitted that they could establish a monoculture, which essentially admits that your prior arguments were wrong, but I'm betting you don't see that.