I had one of those i9 2018 MBPros and it was always super hot. Much happier now with a 13" 4 core MBpro, it runs quite cool and without any fan noise most of the time.
Built a separate AMD 3900x PC with an Nvidia GPU for heavy lifting, and can use that remotely with the MBpro if needed.
My 16” i9 is MUCH quieter than my 15” 2015 Macbook pro, and it’s not like i’m browsing Facebook: i’m constantly compiling and running tests on every file save.
My macbook feels warm but not hot, even when I touch it at the fan exhausts. I do notice my battery only lasting about 2,5 hours though.
Playing games it runs great and while you can hear the fans, it’s much better compared to my 15” 2015.
Personally i’m really impressed with the cooling and performance of the 16”
It seems like the combination of the form factor, components and thermal solutions that Apple uses just don't add up.
It’s basically a different computer in a lot of ways, despite looking similar on the outside.