What are the limitations of using threads for Dispatchers.Main in Coroutines?

Dispatchers.Main in Kotlin Coroutines is designed for launching coroutines on the main (UI) thread of Android.

Restrictions:

• Only run on the main thread — you cannot use Dispatchers.Main for background or long-running operations to avoid blocking the UI.
• Availability depends on the platform — in Android, Dispatchers.Main works with the main thread's Looper; in other environments, additional configuration may be required.
• Not suitable for CPU- or IO-intensive tasks — for these, it's better to use Dispatchers.IO or Dispatchers.Default.

Example usage:

CoroutineScope(Dispatchers.Main).launch {
    // Update UI
    textView.text = "Loading..."
    val data = withContext(Dispatchers.IO) {
        // Long operation
        fetchData()
    }
    textView.text = data
}