The same tendencies that keep people away from bitcoin keep some bitcoiners away from LN.

• LN advocates oversell Lightning as infinitely scalable and problem free today.
• Skeptics are impatient for mass adoption and declare new tech dead early, just because it hasn't taken off as fast as they expected.
• LN incentives are more inclined to centralization than Bitcoin's.
• Some may worry that LN will undercut Bitcoin's security budget.