With serious respect, I’d love to know what you base that on. Looking at the Heipi, I’ll agree the ‘center column’ is different. I personally avoid using a center column if possible. IMO, they are prone to vibrations from wind. However, I really disagree about the legs. I don’t know if you’ve used a PD tripod, but I find the carbon version very stiff and dependable. The PD website includes a report from an engineer comparing many different tripods for a variety of characteristics. Worth a read at a minimum. I’ve used mine in 40+ mph winds in Iceland with no complaints. Plus, the product and customer support are US made. You certainly may have different experiences, but I’m very happy with the results using substantial equipment. All the best.
ron