Refs are human, they were always inconsistent and always made mistakes. VAR people are also human, and they are also making mistakes.
No system will get it 100% right, all the time. It is not possible. But on the average, now we have fewer mistakes than before, thanks to VAR.
We have people here who complain, while admitting that this decision today was obvious and correct! Think about this! Can you believe that someone complains the ref made the correct decision today, because the problem is that some other ref made an incorrect decision a few weeks ago? If you think about it, it makes no sense!