I'm fluent. And nobody has ever bothered to ask me where I'm from.
In some cases the "native" accent can be acquired, and phonology be damned.
If I ever meet any difficulties in conversation, it's usually when I reach the philosophical depth of any talk about screws and bolts and valves. Which I'm not sure I'm familiar with in my own language, so thank you, Argentines, for the beautiful all-purpose phrase "el coso ese"
In some cases the "native" accent can be acquired, and phonology be damned.
If I ever meet any difficulties in conversation, it's usually when I reach the philosophical depth of any talk about screws and bolts and valves. Which I'm not sure I'm familiar with in my own language, so thank you, Argentines, for the beautiful all-purpose phrase "el coso ese"