Staying on Brand ???

The problem is the cost of switching camera systems. It is also a problem of using what you know.

I spent 30 years slowly building up a Nikon system. Then in 2014 I believed the DSLR was a dying breed and that the M43 system seemed to be the future. A lot of influential bloggers like TOP were pushing the system.

I traded in a lot of Ai glass and my MF film gear to help offset the cost of a mixed Olympus Panasonic set up. I believed at the time it would be a long lasting change.

I spent some happy years with M43 with its then almost unique IBIS which opened up a lot of photographic possibilities. It was a great hiking system too.

When you have used a system for many years you get to operate it instinctively and the Nikon digital bodies operated much like my film F801 in many ways.

So when I picked up a cheap SH D700 and a 28PC lens to do architecture "properly" , which I intended to run alongside my M43 kit I did not realize I was due for a radical change back to where I started. The intention was to run two systems.

The large optical VF in the D700 and the D810 which came soon after was a joy to use, compared to the EVF that my EM5 had and also compared to my old APC DSLR. I found the VR in the F4 zooms was very good and with just some more care it matched my EM5's IBIS. But most of all everything was more familiar to me.

So when after six years I decided that my EM5 was getting a bit outdated, I completely transitioned back to the brand I grew up with mostly for reasons of familiarity with the controls and ergonomics.

Also just having one brand avoids a lot of duplication. My DSLR set up, which I use mostly on a tripod with my shift lenses, is very interchangeable with my Z stuff which I use mostly for things like hiking and travel

I think in my case it is a question of "I know what I like and I like what I know"