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People who like to skip hymns usually have no appreciation for the hymns period or do not have the spiritual depth to withstand a 25 minutes hymn.This can be treated with education about the Coptic music and how the hymns were developed and how it reached us. More importantly to treat the spiritual lukewarmness.
When you say "lack of knowledge" - do you mean knowledge of how to literally pray the hymn (hazzat), or knowledge of the meaning behind the hymn?
I have been to the monasteries many times to find that they frequently skip hymns and say the prayers extremely fast. Are they lacking knowledge or spiritual maturity? I think not. Rather, they are so spiritually mature that whether they pray a 20 minute hymn or a 2 minute hymn they can praise God equally as well and benefit from both hymns. This is a higher level of spirituality.
Also, praying mighalo will not deprive people from earning a living to feed their families.