No, you have an issue with a delay sanction that might need to be assessed. Use the proper sanction for the situation. Don't extrapolate beyond that.

No, you have an unsportsmanlike act which needs to be addressed as such. The problem is people are unwilling to penalize unsportsmanlike acts as what they are because they think there is an alternative penalty to use. If it is unsportsmanlike that penalty takes precedence over a YUD/RUD situation.

It's literally a delay. The problem is people using the wrong penalty for the situation.

If they delay after the delay warning, then you have a delay penalty. Go through the sanction scale. Even an intentional delay is still only a delay, whether you like them doing it or not.