Quartz
Hero
From the Basic Rules, Fighters get extra attacks at 5th, 11th, and 20th levels. From the excepts so far published, Paladins and Barbarians get extra attacks at 5th level. So a Ftr 5 / Pal 5 / Barb 5 has the attacks of a Ftr 20. Presumably there's another class that gets an extra attack at 5th level, so a character could end up with 5 attacks per round at 20th level, not counting Action Surge, TWF, or bonus actions.
Okay, that could be a little silly, but consider a 5th level Fighter taking a 5 level dip into Paladin or Barbarian. She gets cool abilities, an extra attack a level early, and gets her 3rd attack at 16th level, 4 levels earlier than normal. Or a Barbarian taking a 5 level (more likely 6 due to the ability score improvement) dip into Fighter. Are the losses ensued (e.g. proficiency bonus) enough to counter this?
Okay, that could be a little silly, but consider a 5th level Fighter taking a 5 level dip into Paladin or Barbarian. She gets cool abilities, an extra attack a level early, and gets her 3rd attack at 16th level, 4 levels earlier than normal. Or a Barbarian taking a 5 level (more likely 6 due to the ability score improvement) dip into Fighter. Are the losses ensued (e.g. proficiency bonus) enough to counter this?