Be Constructive is too subjective to be the number one rule.

We teach children the basics of critique in junior high English classes. Or at least I assume they still do; it's been a grip.

Discovery is terrible because it is too far removed from Gene’s vision.

To me that’s a valid point and constructive because it gives a reason I think it’s terrible.

That's not criticism, that's a thought terminating cliché which leaves no room for discussion of the relative merits of Disco because of some nebulous ideas you're assuming a dead man had.

Do you similarly believe that "The Undiscovered Country" is terrible? William Shatner has claimed that Roddenberry saw the film two days before his passing, and after telling everyone it was good went home and phoned his lawyer, demanding that they remove many of the movie's more militaristic elements.

According to Marina Sirtis, Gene Roddenberry would have hated DS9, and said "No" when the idea was presented to him. Rick Berman has disputed that, but Berman's accounts of how much Roddenberry was aware of even the initial pitch and character sketches have varied considerably over the years.

It isn’t very Starfleet of you.

Is it particularly Starfleet of you to complain about things being "woke" as I see you did in another comment?

Infinite diversity in infinite combinations. Disco is simply another combination of the elements that make Trek. It doesn't have to be to anyone's particular tastes.