Likewise, immigration to work in the US is "is not always easy and takes time." There's no difference; if you disallow immigration to other countries at all "be

Likewise, immigration to work in the US is "is not always easy and takes time." There's no difference; if you disallow immigration to other countries at all "because it's not easy", then there's no point in discussing where scientists won't go - you believe they won't ever move, no matter what.