We totally understand your concern, jshe.
We'd like to inform you that if a Windows application or service uses lots of CPU resources for an extended period, the processor will get warm. That is expected and normal, regardless of what brand of computer you're using. You should use performance monitoring tools to determine what is causing the high CPU utilization. Also, the faster the processor, the warmer it can become. When an i7 processor is under high utilization, it will become warmer than an i5 processor, which in turn will become warmer than an i3. Devices can also be warm to the touch or fan run for variety of reasons like application is consuming CPU resources and CPU is throttling. You can view apps with heavy utilization on the Task Manager.
In addition, Surface devices adhere to all laws and guidelines related to temperature and thermal. You can refer to public information on adherence at Safety Information . See the sections called “Heat related concerns” and “Heat related concerns for wearable devices.”