Why are customers of semiconductors likely to opt for old technology?

[MarkBruns]

Can plasma‐assisted chemical vapor transport (PACVT) processes be developed to produce decent quality crystaline semiconductors?

https://arxiv.org/abs/1910.02149

Instead of being beholden to or constrained by the existing physics of failure or drivers of reliabiliry issues that emanate from existing capital expenditures and existing human skillsets/familiarity with current fabrication processes ... why aren't consumers of more technically advanced and generally more reliable next-generation semiconductors?

https://arxiv.org/abs/1904.05117