Landraces still produce variable plants, particularly in regards to terpenes, potency, and bud structure. Durban Poison will stay low and grow like a shrub. Grows much more like an indica than a sativa. There's multiple cuts of Durban in the CO scene, some of them are good, some of them are not. It's a strain that's been offered by multiple companies for like 20 years. If you think that growing a landrace is going to be like growing a bunch of clones, you have obviously never grown a landrace from seed before.