However, different observers moving with different reference frames will disagree on the value of this conserved energy.

Then observers moving at different speeds can disagree about whether event A occurred before B or vice versa.

Intelligent, well-meaning observers disagree over how to find a balance.

Certainly the alterations are insignificant from a practical standpoint; otherwise competent observers would not disagree.

This applies to the total energy of systems, although different observers disagree as to the energy value.

Families, officials and other observers disagree on the severity of the problem.

Undoubtedly, there are some cleavages, but observers of the Taliban disagree about their extent.

However, observers disagree on what caused the protests to become violent.

But international observers and the opposition disagreed.

The lesson is that observers in different frames of reference see the same phenomena but disagree on their reasons.