For
It reflects modern multicultural life.
Against
It can sound confusing and disrespectful to grammar.
Anonymous excerpts, translated where noted.
“I can mix languages with my family and friends with little to no issue.”
“When you speak multiple languages, you switch (often mid sentence) to the language that's most convenient.”
“I lose my entire train of thought and end up forgetting how to speak both languages.”
“I'll just stick to one language and will not code-switch because it's useless and doesn't move the conversation forward.”