You probably had a bad experience with a low-quality planter. Yes, all outdoor wooden things will rot eventually. But they will only do so “in no time” if abused. Constant over-watering, for example, is such an abuse. Some people want to do good by lining planters with plastic. This should not be done as it traps moisture in between the plastic and the wood.
If looked after, one can expect years of good service before some maintenance might become necessary. GardenStuff uses thick timber, not thin planks like from pallets. GardenStuff uses rust-resistant screws, not staples or nails that rust. Why? Because rust causes wood-rot to set in.