Now you can buy a 5D4 to use first. A new model comes out behind Canon, so we can consider upgrading or replacing it. Canon cameras are also very active in the second-hand market. I upgraded and eliminated 5D2, 100D, 450D and the like before, and they all sold quickly on the Internet.
Second, Canon's new SLR supports dual-core focusing function. As long as the "live view" mode is switched, the SLR camera becomes a "micro-single camera" in one second. You can shoot with a touch screen, just like with a mobile phone.