Are cordless orbital sanders powerful enough for serious woodworking?

For most cabinet, furniture-refinishing, and DIY tasks, reviewers across woodworking communities agree modern brushless cordless sanders are plenty capable. However, several high-trust forum threads note that for heavy, all-day stock removal a quality corded sander still wins on sustained power and runtime, and that battery sanders slow down as the pack drains. Bigger batteries (4.0Ah+) are widely recommended to keep speed consistent.