Rules of play revised or not?!

[CWB001]

There is nothing in the law about intent and a service judge can have no knowledge of a server's intention behind a pause. But the pause is banned, nevertheless.

[Erik L]

I am afraid things are not as black and white as you seem to present it. Undue delay is banned, a pause being part of natural movement sequence is not. Such a pause does not constitute undue delay. The law focusses on undue delay and not on any delay. It is the length and nature of the pause which determines whether there is a matter of undue delay, and whether a service is going to be called or not, not the pause as such. Finally, reading a players intention especially in the process of serving and receiving is really not as difficult as you claim. It just requires sufficient experience.

[CWB001]

The law focusses on undue delay and not on any delay.

I'm afraid you are wrong. Law 9.1.1 says:

"On completion of the backward movement of server’s racket head, any delay in the start of the service (Law 9.2), shall be considered to be an undue delay; "

In other words any delay is undue delay, by law.