How many pieces should a pliers set have?

More pieces isn't automatically better. r/Tools commenters note that in multi-size KNIPEX Cobra and pliers-wrench sets, the largest sizes can be redundant (for example the 12-inch being too close to the 10-inch). For most home users a 4-to-7 piece set covering slip-joint, long-nose, diagonal, groove-joint and linesman covers the majority of tasks.