Primary is a tough thing. Not a programmer or developer who uses it primarily for one thing. Some photo work, some video work, office apps primarily PowerPoint, Excell, Publisher. Some appraisal software through bootcamp or VM, some video conferencing, some Citrix, some route planning for motorcycle tours.
So basically a little of this, a little of that. Nothing that would or should cause undue hardship or stress to the machine.
First would crash almost consistently when waking from sleep. Apple wanted to collect that unit and arranged for a swap. Swapped unit arrived with sharp nicks along the left edge near the speaker grill and they swapped it again. 3rd would have random runaway heat issues even doing the simplest of things and would frequently miss certain keys, requiring you to have to press them 2 or 3 times in order to register . The 8 would also tend to stick.
Gave it a 3 week break while looking at some alternatives. Picked up a 4th from the local Apple store for some side by side comparison and to help make up my mind which to keep and which to return.
Really Like the MBP and I have had nothing but Macs for the past 12 years, but I don’t trust the MBP further than I could throw it
All have been the 15” model.