But vocal groups on the internet are not 'the market'. What backlash is there in the market? As far as I'm aware the pre-orders are still not all fulfilled from people who ordered on the first day. The demand is huge, and once the dust settles, I suspect the R5 will be a milestone for Canon. The outcry seems louder and greater, because so many people are interested in this camera this time and therefore the absolute number of disappointed people is greater too.
I would suspect Canon to go all out in the neir future. It started with the M6 II, and the R6 and especially R5 are just taking the technology that was hinted there to their logical conclusion. In hindsight, the 1DX III is pretty conservative still, but that is also what one would expect from the 1-series. The R5S/R3, R1 and potentiall R7 will likely push the boundaries even further.