I see bigger factors in play with most of the subjects IMHO.
Information spread has increased in the last generation from almost nothing to everyone having substantial access to most everything. This has made riders more similar.
Add Valentino's school coming to fruition with several of the top winning riders sourced there.
Still with 40% Ducati on the track there are few dominant winners. Not an even spread of wins between them = it's not entirely about the tech.
What happened to Japan? It's what's happening to the entire industry. Honda was selling >20, million bikes a year, 2019, recently at 16.8 million. Yamaha etc same deal.
Japan's market is Mass market: Component and tire companies getting hit hard as well. Asking big questions.
& Youth Market: They'd rather buy an iPhone than a bike.
Dorna viewership: See above. They also do not have €100 for subscriptions to motogp when their OpenAi subscription has got their cards maxed pushing tiktok videos. Dorna put its self into this business model which has sucked for teams because the small number of viewers compared to a free or low-cost viewing is many times the number of viewers. So the marketing pay-off for eg. tire companies is smaller compared to the enormous expense. This is why the changed to a single tire rule. If you loose half the races, there's no marketing pay-off. If you win ever race, it's good. For all the other sponsors it sucks. It's very expensive.
EU bikes not mass market. 40-50 somethings with disposable income buying Ducati, BMW...Sales are up even through Covid.
Ducati sold 53,000 bikes in 2022,
Compared to 20,000,000. That's a really big number difference considering the same drop in tire sales, parts, repairs, add-ons... The industry is in big trouble.
The business model has been "increase prices every year" at a rate much greater than average salaries increase if at all with inflation. Track days, races, tires everything. This model has pushed to its greedy limit. Why less youth are interested. It's simply out of their reach.
eg. A track day at Mugello is now about €1000. including all costs.
The average salary of an Italian is €1500 a month. Do the math. It's no longer possible for the average Italian and that was always the customer. Now it's all changing to a smaller and smaller crowd. I got a call about was offered an exclusive VIP track day spot in an 80 person max at the track for a low low price of €8400. for the day catered of course.
How is this going to work if the track day customers are the Kenu Reves of the world? One year they're at the track the next year they're sailing or flying or into cars. I don't see this utra-VIP model working.
Japanese companies are not investing in racing the same way the EU bikes have been.
Add - (this is hear-say via Jack Miller) - Marc was pushing his garage to customize everything including staff changes to fit him as he dominated. He became injured pretty consistently for years and now his garage and bike's engineering are way off. That was a risk they took, all eggs in one basket, and it was a disaster.
According to both Vale and Fabio, all bike's in Yamaha garage's setups are dictated by engineers in Japan not even at the track to a calculated ideal based on telemetries and egos. This has been frustrating to Yamaha pilots. Fabio was a Cinderella and it fit him well at first. Now? See interview with Morbidelli, he's not so excited to return next season to Yamaha.
Casey Stoner (via video interview) was consulting a few Ducati riders Jack, Pecco etc. They proclaimed difficulty getting their set up perfect for many tracks stating the bike is great in some sections, while a disaster in other sections, it was impossibel to get it right everywhere. Casey told them to "stop messing with set up and ride it differently." eg. Instead of changing throttle parameters, short shift coming out of turns. They all improved with significant results after that.
This is where the interesting racing is for me. Watching the riding skills evolve.