Are your words clear? Can people understand the words when you sing?
You can over-do articulation and you can also under-do it. Most songwriters want the words to be intelligible. The words have meanings and if they cannot be understood, the meaning is lost.
Many times, lyrics are misunderstood and there are plenty of jokes around about this.
Consonants and vowels have sounds and it doesn’t have to take long to clean up bad articulation.