It’s not that loanwords are a thing in all languages, it’s that they are everything. A non-loanword would be a word without a historical etymology. There are some in physics, and everyone is laughing at them “quarks”
Some languages or populations may be stricter with their grammars, but I guarantee you they stole that grammar. A few things changed over time of course, but it’s going to be very similar to how they talked before, mixed with how other people around them talked. You can’t just make up new grammar and hope people will understand it (see attached Lojban)
It’s not that loanwords are a thing in all languages, it’s that they are everything. A non-loanword would be a word without a historical etymology. There are some in physics, and everyone is laughing at them “quarks”
Some languages or populations may be stricter with their grammars, but I guarantee you they stole that grammar. A few things changed over time of course, but it’s going to be very similar to how they talked before, mixed with how other people around them talked. You can’t just make up new grammar and hope people will understand it (see attached Lojban)