Perfect stats let you learn the speed tiers.
Perfect stats can turn a 2HKO into a OHKO.
Perfect stats can turn a check into a counter.
Learning what's super effective against what takes a few wiki searches to solve.
If anything watch a bunch of online battles to learn the common play styles and what pokes carry what moves.
You are right that experience is key, but you can save a lot of time by making perfect pokes from the start.