MediaTek wants a piece of the flagship pie and the Dimensity 9000 will kickstart its foray into higher-end smartphones. However, Samsung and Apple will indubitably be a major barrier in the flagship smartphone market especially in the US where channels are dominated by carriers.
https://www.notebookcheck.net/Flagship-MediaTek-Dimensity-9000-and-FiLogic-RZ600-chipsets-are-looking-impressive-but-they-may-have-a-hard-time-breaking-into-the-U-S.580915.0.html
It takes time to cure a long disease but it can still be cured. I think Mediatek would break into US market pretty soon.
I think this Mediatek chipset would be capable of breaking into the American market and would so well in the smartphones.