Interesting that you put these two things go together, as if they go together; no, they are distinctly different, and do not go in concert. Putting them in concert is only your opinion.
If people come to my home (in this case, country), they have a duty to assimilate and to respect my values that maintain stability and order; there is no need or requirement for me to adopt any of their values, as their values could be opposite mine, and be destructive to my civic order. They came to my country, lest they forgot whose house they entered.
Now, if a group of different people end up in an area by traveling there and decide to form a nation state, then I agree that acculturation is proper in said situation because there are no established values, laws, traditions, and civic structure in place which to assimilate, and people should develop a system that all can work with. Furthermore, if later on a new group arrives, the now nation state has no requirement to disrupt its civil structure to accommodate the new arrivals - the new arrivals should assimilate and maintain the order and respect the established values.
Cart before the horse thinking.
The problem lies in the fact that, historically, these specific groups have proved not to want to be part of the societies which they enter, and they create more havoc than good.
Actual assimilation to the host country’s civic structure and values is why we do not see such calls hurled at immigrants from India, Asia, or many other parts of the world. Those other groups come and join the society in its civic structure. They do not show up, for example, and tell the host country’s judicial system that they function under Sharia law, not the host country’s laws. I posit Muslims would not have this problem if they have, in the past, shown to assimilate and respect the values in the countries, which they chose to enter.
When I lived in Europe I was amazed of how the Muslims set up huge areas and lived completely different lives than the French, with their own street signs etc. (Well, dumb for the French to allow that in the first place). Cannot blame Hungary and other Western countries for not wanting the same within their borders.