As I said before, whatever the specs of the 90D it doesn’t mean the current canon cameras you own stop working. Carry on using those at 24p. Or, as you’ve said. Move away from canon completely. Life’s to short to be so angry. I read the 6500 successor is being announced the day after the 90D so get that.I travel for work, meaning I dont have the luxury of having a camera for every need with me. BM would be great if the battery life wasnt comically bad and if it had useable AF. Likewise, I dont want to carry large hard drives the world over to capture ProRes if I dont need it.
I prefer cameras that are swiss army knives, and by and large, the XXD model has been that. Great for photography except in the lowest light conditions at a budget point that makes a lot of sense. Solid enough on video to work as a B-cam as well to whatever my primary video camera is (currently GH5, but has been a variety of more video focused options). Sturdy and well built despite not being xD level sealed. Doubly impressive since a lot of people were pissed when the 60D lost the build of the 50D, and yet it became their best-seller.
I understand Canon using old sensors on their R and RP cameras. I understand them recycling older focus systems onto the XXD cameras. I understand them not putting top end features (IBIS, 4:2:2, etc) into them. That's all in service of keeping the price down and keeping their higher end models selling. Removing a baseline video feature like 24p....cant explain it with any reasoning. It'd be like removing the Large Jpeg mode and only leaving Small.
Im not really angry though; sadly I've grown used to these dumb Canon decisions. Not adding 4k to the 6dII. Dropping battery size on the RP and excluding 1080/24. Ive mostly been waiting for the next upgrade to the a6500 to just completely move off Canon. A solid 90D, especially when it comes down in price in holiday sales, might have tempted me to stay a little longer, since I've owned the 50D, 60D, and now 80D and have found them all very reliable. But if they are dumping baseline features for fun...no reason to stay.