You may be right, but that doesn’t reflect my experience. Most the BR’s I rip are just barely released (pressed) and I have a 100% success rate with makemkv. They all literally worked on the first try, even new releases. Maybe I’m just lucky.
The only problem I’ve had is when they try to make it hard by putting a gazillion titles on the disk to make it hard for you to figure out which is the right one. That sucks, but is not insurmountable.
This has been my experience too. I've never had makemkv fail to open something. I suppose that if the dude who runs it ever gets hit by a bus or something, then it might not be useful going forward from then, but presumably somebody else would take up the work.
The only problem I’ve had is when they try to make it hard by putting a gazillion titles on the disk to make it hard for you to figure out which is the right one. That sucks, but is not insurmountable.