I understand that you're angry and frustrated. But if you want to understand what's going on, then you need to ditch the emotion and think logically about what's happening. Also, it would be a good idea to listen to the people who are only trying to help you. Flinging insults around isn't constructive.
You keep framing tis in terms of Canon, and making accusations like "The brand deliberately changes a protocol and a mount to make you buy new lenses". If you think about this, and look at what's happening in photography generally, you must realise that this simply isn't true. All the camera manufacturers have changed their lens mounts:
- Nikon from F to Z
- Sony from Alpha to E/FE
- The Four Thirds group to Micro Four Thirds
- etc.
And all for the same reason -- we don't need mirrors any more, so we can have more compact and efficient cacmeras. But that needs a new lens mount. This isn't fanboyism, it's just fact.
You state that "Iris lenses are full manual, there is literally nothing to control besides aperture" -- it sounds like you don't understand how your lens works, because this is self-contradictory. If the lens was fully manual, then the camera wouldn't be controlling the aperture.
Fully manual lenses have an aperture ring mechanically geared to the iris blades. With such a lens there is literally nothing the camera can do to stop the aperture working. I have a Lowa lens on my RF cameras that works like this. But the Irix lens is electronic -- on their web site, I can see the electronic contacts on the back of the lens -- and it looks like Irix have screwed up their implementation of the protocol. You should contact them about this.
You can change camera brands if you like -- I literally could not care less -- but if you expect this to change anything, prepare to be disappointed.
