As long as people keep pretending those are issues inherent to the design and doing it right is commercially nonviable, manufacturers will have no incentive to increase manufacturing costs to produce a superior product.

If spending an extra $5 to manufacture it right results in no increased sales because people keep pretending that it's a problem inherent to the design, and manufacturing it right presents no marketable competitive advantage because people are going to lump together all PF systems as prone to creak anyways, instead of putting blame where it is due, what do you think the people running cost-benefit analysis are going to do? They're not going to pick the option with no ROI. Consumers pretending that a frame manufacturer can't do it right if they tried and that it's an inherent problem means them actually doing it right is going to result in negative profits every time.

Furthermore, I'm not even a fan of BB30, so I'm really not one to offer a defense of it besides that it's possible to do it right, and it's completely logical from an engineering perspective to have press fit bearings. All those threaded BB cups also use press fit bearings, just in threaded cups. I also think that solutions like the Praxis are a better solution than gluing a threaded insert into a frame. Just because you want to reintroduce threads into the system does not mean you have to glue the threads into the frame. But that's what anti-press-fit people want.

If you're a frame manufacturer and you have 4 options in order of price from most to least expensive

High quality PF
High quality Threaded
Low quality Threaded
Low quality creaky PF

They're going to chose low quality PF when it's cheaper than low quality threaded and the carbon engineers and marketeers want the big oversized BB shells to sell more units. If people act like the problem is with every PF design, there's little reason for them to make a high quality PF which will result in no additional units sold and no return on investment. You can complain about threads all you want, it's very unlikely that threaded will yield a higher ROI compared the marketing advantages of an oversize PF BB shell. But it also has a negative effect, it encourages manufacturers to go with cheap PF BB shells instead of high quality ones, because people won't even acknowledge it possible to do right and it's a question of manufacturing quality.