MediaTek seems to be pretty confident that the Dimensity 9000 will not have any of the throttling or heating issues reported with the Snapdragon 888. MediaTek representatives said that the Dimensity 9000 will offer power consumption advantages over the competition, and that the company is looking to eventually offer chipsets for Windows on ARM in the near future.
https://www.notebookcheck.net/MediaTek-on-the-Dimensity-9000-There-s-only-one-company-having-heating-issues-and-it-s-not-us-plans-to-offer-Windows-on-ARM-SoCs-in-the-near-future.581209.0.html