Daemons like duetexpertd should be running at a low QoS if they're doing background work and shouldn't be capable of interrupting an app. So you've found a bug. You can report it with Feedback Assistant if you want.
Personally I have seen the situation get massively worse since I entered the macOS ecosystem in '23. My machine is running hot right now on flat surface with a nearly 0 user-side load. It's a soup of system processes each taking 15-200% of my cores. I used to not have to mess with the fans at all. Now, I have to keep them on literally full blast via third-party software just to comfortably use my laptop even while simply browsing the web (and I have JS turned off by default).
So I feel silly even considering engaging the Feedback Assistant. My demands are for the ability to categorically disable these services. I do not use Time Machine at all, why is the backup service slamming my machine? I do not need any AI-enabled media features. I don't need document title suggestions. I don't need LLM-powered autocorrect at the cost of heat and performance degradation. I don't need Spotlight indexing. At all. I want it to be a calculator and app launch bar. Literally nothing else. I despise user filesystem indexers as a rule and do not require them to use my machine effectively. I do not use iCloud in ANY capacity, nor Siri. So why are duetexpertd and Siri constantly obliterating my cores and causing sudden performance degradation even while in Gaming mode? I have plenty of free space, so it's not a thrashing issue, either.
My feedback would be that literally half of these services are completely unnecessary to me and yet I cannot fully disable or even configure them. I know this feedback will be completely ignored by Apple, because they are in the business of dictating to me what to expect from my computer and not the other way around.
As for turning things off, it's a bad idea to sell a product you haven't tested, and it's also a bad idea to add settings that randomly break stuff because users will forget they changed those settings. So it's difficult.
[0] you can also become that person: https://careers.apple.com/en-us/details/200687840-0836/softw...