In general I would agree with you, but not for cameras. I want a Frankencamera with Canon glass and ergonomics, Sony sensor, and Olympus feature set. Nobody makes the camera. Of the ones that are made, nothing hits all the buttons, but several are close enough to consider. Of those, there is no clear winner so I stick with what I have.
I want the same thing as you but there is no perfect camera exist even if you have the money to pay for it.
I also don't think it's in the interest of the camera company to make a perfect camera because that would lead to their eventual demise especially when in 2-3 years it can be had for cheap on the used and discounted old model.
As with everything in life, there are trade offs. I have learned to evaluate my priority, shooting style and professional needs.
Once I figure out my priority and what I want in a camera, I think I found one camera that come the closest to what I want and I can adapt my EF lens (24-70 2.8 II) and Sigma EF lenses. It's not perfect, but it's the camera I wished Canon would have built.
- 5.76 million dot EVF 120 hz
- Great ergonomic, backlit button, weather sealed, fully touch screen LCD with good menu, good color
- 24 mpx "Sony" sensor that beat Fuji film medium format in DR test & has clean 12800 ISO
- Dual card slot with XQD/CFExpress support
- IBIS 6 stop (hand held 4 seconds)
- EyeAF and AI tracking.
- USB-C charging
- $2500 with free battery and grip.
- 4K 60, unlimited 4k 30, 180 FPS HD
There are some flaws with this system but nothing I deem it to be serious. I can live with those limitation especially for $2500 with $430 pre-order bonus (battery and grip). If someone come along and make a perfect camera, I'll upgrade consider it as a cheap upgrade consider my Canon 5D IV can be fetch around $2000.
I'll first to admit this upgrade is to satisfy my wants not needs. If I can create and charge people $6K for a wedding with a Canon 6D years ago, I learn really quick that gears aren't everything. At the same time, if you have money, why not enjoy life a little

.