Conservatism that meets 1 - 3 can be defined and lived - for instance the Amish are doing so.
The problem is not that conservatism can't be defined or followed it is that 99.9% of conservatives are not defining or following anything.
For the vast majority of conservatives, conservatism is something like Jesus is to most Christians - you say you are a follower and then do whatever you want.
If we try to define Trumpism then "do whatever you want" also comes to mind.
Of course if a conservative gave any of this any thought he would realize how incoherent his views are.
* You can't like AI and other new technology and be coherently conservative.
* You can't like war and be coherently conservative as war creates change.
* Even racism is a deeply unconservative thing to do as the definition of the artificially created "races" is constantly changing.
* And of course being pro climate change is the least conservative stance imaginable.