I don't agree with you. But let's assume you're right. In that case, why do you think Western games also have a similar 75-25 sales split ratio?
Because of the popularity. People love the popular thing.
And 75/25 should tell you that not everyone is that interested in the same thing. With 115m ps4, and 50m, sales usually are 10-15m. With the new age of gaming, new games pop up. Skyrim/ the witcher 3. People who like the witcher 3 won't like the Skyrim, same for the others.
Let's go back to Japanese one. Usually Japanese sells alot, because of the ps4 having alot of people in Japanese compared to xbox. Those people are the majority of people who buy it. Since those games are targeted to them. I never knew what persona is. And still have no clue about it. While I know alot of western games. Japanese are the same. They don't know alot of western games like we do. Those games aren't targeted to them, they are targeted to us.
If a new witcher 4 or new persona is released, most western will pick witcher4, same how Japanese will pick persona. Its all about cultural thing.
I feel more comfortable with western games. Since I can understand them easily, compared to Japanese market, which uses their culture.
Easy way to look at is live service games. Xbox has the SOT. And the number of active players where 18m (pc+xbox). Halo Infinite is anticipated title. Mainly for its MP (others will play for the story). Those games demand social interaction. Playstation doesn't have that kind of games, aside of the popular games, which are very popular in that platform. The lack of Playstation output for these kinda of games, pushes people to buy social games, which drives its numbers up, and makes the 75/25. If Playstation had those games, I doubt we would have seen those 75/25 output. 50/50 to 40/60 split, since people are busy with Playstation social games, and don't bother themselves with popular games.
Playstation defeats xbox sales easily, because of its numbers. The 50m people at xbox don't have the same interests. 0.5/10 of xbox players might like Japanese games, 2/10 might like cod, 1/10 might enjoy skyrim. Those are small numbers, when you compare to Playstation. It will be double of xbox players. For every xbox players that love genre, you will find double of that in the Playstation community.