More pressure means stricter requirements for all of those non-obvious steps like bending and soldering, and specialized hardware for things like joints and bearing.
Both of those mean specialized factories, supply chains, and labor. AKA higher prices unless it becomes the dominant option.
Also, in larger systems higher pressures is a safety concern.
None of that is a showstopper. But those are severe hindrances for a technology. A government can just fix every one of them, but then it would require government involvement.
Ages ago there was a company that planned to convert Tyson Chicken carcasses into gasoline via depolymerization. Problem was that’s a high pressure process, and they didn’t take that seriously enough at the start. Leaks everywhere. Neighborhood smelled like burnt chicken feathers.
They had to shut it down and redo all of the welding (I don’t recall if they fixed existing welds or pulled the whole thing apart). Afterward they still got complains about the smell, swore they’d fixed the leaks and the neighbors were imagining it. I suspect some esters were coming out the end of the pipe, and/or the dust everywhere around the place was saturated from the pilot project and every time the wind shifted they got another nose full.
Both of those mean specialized factories, supply chains, and labor. AKA higher prices unless it becomes the dominant option.
Also, in larger systems higher pressures is a safety concern.
None of that is a showstopper. But those are severe hindrances for a technology. A government can just fix every one of them, but then it would require government involvement.