But... that sort of temperature is totally normal on a lot of modern laptops?
Hell even some of the modern desktops.
Yes, it is.
As I pointed out earlier, my Mac mini 2018 (Intel Core i7) hovers around 100 °C when the CPU is maxed out, like during a Handbrake encode.
And same with my Acer Swift 3 notebook. Both of them have some sort of thermal grease on the CPU. I don't know what they are using, but it's probably not MX-5 based on the fact that both of them released before MX-5 came to the market.
These systems are designed to use their CPUs to basically the maximum limits of their TDP. And there's nothing new about this.
In fact, notebook computer manufacturers normally don't refer to these systems as laptops. They have been well aware for about two decades that these systems run so hot under load that you might burn yourself if you put your computer on your lap. And Joe Consumer would rather pay $500 instead of $1500.
In any case, these systems are designed for a wide variety of users, usage cases, and budgets. Not everyone is going to own a perfectly designed, perfectly vented system that has a large buffer for thermal capacity when they just want something portable under 1.5 kg.
Let's remember that most consumer computers are notebooks. People want something that might run 12+ hours on a single charge rather than a 3 kg notebook that basically needs to be plugged into a socket.
Sure, maybe a notebook could run cooler if you put a big fat heatpipe in it with 2-3 fans but then the owner might be lugging around something an inch thick. Or the manufacturer could keep the svelte chassis and throttle the CPU (or GPU) at 80 °C hence partially nerfing the components' maximum design capabilities.
A funnier note is that many Mac minis end up in data centers and other air conditioned server rooms. Running full bore at 100 °C is what many of these units do.
The funniest thing is that with Apple taking control over their own silicon, their stuff is better from a performance-per-watt metric than anything AMD or Intel can offer.
If a thermal grease can work at ~70 °C on some custom built deskto PC but breaks down at >90 °C on a mass-market notebook, that basically limits its applicability.
Shall we guess where MX-5 is?
Let's remember that Arctic is the one who took MX-5 off the market. Not CallandorWoT. Not Mussels. Not W1zzard. Not Chomiq. Not me.