Product designers have to take various tough decisions while designing a product. (Flexibility or Customization) Vs (Convenience or Time) is one such decision. For example, a barbell with fixed weights is convenient, takes lesser time to use Vs the one with flexible weights. Flexibility & configurability (More) always increases your cognitive load in any kind of product. Fixed and definitive (Less) always makes it easier for the customer to decide and use quickly. A fine balance is very important otherwise the product might become unusable.