Three materially different positions
A principal token position targets the underlying principal at maturity and is often used to express a fixed-yield view when purchased below its expected redemption value. A yield token isolates variable yield and can gain or lose value as expectations change. A liquidity position supports trading and adds pool, range and incentive exposure.
Pendle can suit experienced users who understand the underlying yield source and maturity mechanics. It is a poor fit for anyone who reads an implied rate as guaranteed, needs immediate redemption under all conditions or has not verified the underlying protocol risk.