I feel like decentralization and security are too closely linked for them to be placed in the triangle separately. Could you give an example of a project that has good security/scalability or good decentralization/scalability?

In other words, in what situations can one increase security but somehow lower decentralization, and vice versa? I don't see how that's possible.

The metrics I use to judge a crypto are:

However, in the decentralization category I would also include security.
In the inflation category I would also include distribution.
In the Speed category I would also include scalability.