I use my interchangeable lens, Fuji X-T1, most of the time, although my fixed lens, Sony RX1r, is a bit more compact. The lens I use more than any other is a Fuji 28mm equivalent. This set up is not much bigger than the Sony Rx1r, with its 35mm. I have a Fuji zoom lens, but it usually stays home.
Because most of my photographs these days are street shots, the most attractive feature of a 28mm, for me, is the angle of view. Mine is also a faster lens than my zoom. 35mm is a great length, and it was my favourite during my film years, but the 28mm is significantly wider, and so it's just right more of the time. Luckily, a Fuji sale price enabled me to get one.
However, I certainly think that Sony RX1r is the easiest to use of the advanced cameras I have owned. It's a lovely size and, in fact, I carry it often in my bicycle panniers.
I usually walk around with the 28mm, and change to my Fuji 50mm equivalent if I find myself shooting portraits.
I must also add that simple, film cameras are definitely seductive. My son, who is a photo journalist, left all of his normal camera gear at home when he packed for his most recent trip to Japan - he even left his Fuji X100s behind. Instead, he took an Olympus XA, and had a grand time.