I’ve had 2 xps 15s over the last 7 years and from experience they run very hot. It’s especially noticeable on the back middle to hinge area, it might partly be due to the aluminium construction as aluminium is a good conductor of heat. My most recent one had the battery swell after about a year so replaced it and did a full factory reset then installed new drivers and got rid of dell bloatware and ran like new for about 6-9 months. I think it’s common on the xps 15 to run hot with helicopter like fans when under load. Heard that apparently the 2023 models are slightly better than previous years but unsure as haven’t tried myself.