Both fans are running loud enough to notice: 2600RPM, about 27%, and that's about average when it's not asleep. It's too loud to watch a quiet movie without headphones.
If I had full control of my kit, I would seriously consider ditching the 16" MBP in favor of a 27" iMac just in the hope that the cooling system isn't a complete disaster.
As for the ARM question, I am very much looking forward to buying an ARM Macbook Air (or whatever) for personal use.
But since I have no idea exactly when one will show up that does what I need; and since I expect the Intel Macs to be supported for many years to come; and since especially for a desktop it's also quite nice with other OS's; I wouldn't hesitate to buy an Intel Mac if I needed one.
Just not the damned 16" MacBook Ventilator.