Re: 24-cores on a laptop...
>I'm guessing it actually has 8 cores with 16 threads.
You are right, I was being lazy in the way I described the Ryzen 7 Pro 4750U.
>Depending on what you're doing, you probably don't need most of those cores often.
Not sure if I've actually managed to get more than a blip across all the cores, although have had the fans start a few times... Which is probably a good thing as one review noted from their benchmark runs the typical laptop cooling system is limited and so you are likely to get your fingers burnt (depending on where the CPU is located) and thermally throttled...
Whilst I agree in general with your usage assessment and CPU selection methodology, I also factor in bang-for-your-bucks - Lenovo (and subsequently Dell) were selling these at sub £700 (ex.VAT), obviously there was nothing with an Intel CPU at this price point that came anywhere near the AMD systems in terms of both CPU performance and battery life.
I've not been disappointed and note I've been able to run a "power user" suite of desktop applications and not worry about firing up Teams and Zoom for a video meeting.
My only grip is that the USB-C connector and power supply doesn't like staying in permanently, so whilst I can Windows Server 2019/2022 (16 logical cores = minimum licencing requirement of 16 logical cores) it is not advisable to use such a laptop as a server. [Aside: 24-cores makes legitimately running a correctly licenced Windows Server a little more costly, for no discernable benefit.]