My interest in photography aligned with the upcoming of digital cameras, being able to take a lot of pictures without the limitation of film roll and the need to have a service developing them.
Started out with an Olympus ultrazoom compact, I think a C-700 or something like that. I later switched to a Canon Powershot S5 for more megapixels and still a lot of zoom range. Knowing nothing about photography the marketing of "megapixels" and "zoom" were the most important drivers for picking a camera.
I then decided to go DSLR and remained with Canon, for not a really specific reason. So there came a 450D. Doing sports most of the time, I upgraded to a 7D for more burst rate and a better controls. I then upgraded to a 7D mark ii for improved AF and a bit more megapixels.
When struggling a bit in low light, I decided to step into full-frame and added a second hand 5D mark iii. I then got an opportunity to get a 1Dx mark ii which was great for my sports photography. No longer really using the 7D mark ii I decided to part from that.
And along came mirrorless. I decided to go for the EOS R as it had the same battery as my R5 (and R7 previously) and a bit more megapixels than the EOS RP. Also the form factor of the R was better for me than the RP.
I enjoyed the advantages of mirrorless, but it was pretty clear that the EOS R would not suit my sports photography. Then the R6 and R5 came out and while the R5 was far more expensive and I got an opportunity to get an R6 I got a new R6. With the improved autofocus and a mechanical shutter of 12 fps it suited my sports needs with the advantages of mirrorless. I then decided to trade in my 5D iii and 1Dx ii for a mint condition second hand R5. I wanted the R5 for the croppability of the 45 megapixels.
With the R6 and R5 there was not much use for the R anymore and when the R7 came out, I decided to trade in the R for an R7 to use the crop-factor for reach in combination with the 32.5 megapixels for my sports shooting and some of the occasional birding I started doing over the years. For birding I was mostly happy with the R7, even with the higher ISO's (using DXO in post) and the rolling shutter was not much of a problem in the way I shot.
For sports I never was quite happy with my R7 shots in comparison to my R5 shots, never exactly figured out why. So when R5's became cheaper at the second hand market, I bought a second R5 to have 2 R5's for sports, with the R6 as backup or occasional 3rd cam for a wider angle lens.
My next upgrade to improve on my sports shooting was an old EF 400mm f2.8 L IS USM , with the only caveat being the reduces FPS in mechanical shutter. So I started to shoot electronic shutter on the R5 for the higher frame rates, as a later version of the 400mm was out of budget. To acquire the 400, I had to trade in some gear, amongst others my R7 (which I would otherwise hold on to for some birding during a walk in nature).
Rolling shutter was very manageable, but I had to remember not to pan too much or move along with the action too quickly. I was eyeballing the R5 mark ii, but the upgrade seemed limited over the R5 when it was announced. But shooting more electronic shutter with the 400mm, the rolling shutter improvements of the R5 mark ii gave it the edge. I then got an opportunity to get a R5 mark ii and added it to my kit. As I will never use 4 cameras at the same time and would always prefer the 45MP over the 20 MP of the R6 I decided to sell the R6.
So now I have 2 R5's and a R5 mark ii. I think over time I might trade in one of my R5's for another R5 mark ii, so my main camera's will be the same.
I'm happy with the AF of the R5 for my shooting and the 45MP's of the R5's for my use. The rolling shutter of the R5 was more or less OK, but I consider the R5 mark ii definitely an improvement and sufficiently fast sensor readout for my use. So I hope GAS will stop after another R5 mark ii, at least for the camera side of things. For lenses there is still a lot to wish for... the weight savings on the 400mm f2.8 are significant, but I just can't justify the huge price of those lenses.